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On October 1, 2017, a mass shooting occurred when 64-year-old Stephen Paddock opened fire on the crowd attending the Route 91 Harvest music festival on the Las Vegas Strip in Nevada from his 32nd-floor suites in the Mandalay Bay hotel. He fired more than 1,000 rounds, killing 60 people and wounding at least 413 others. The ensuing panic brought the total number of injured to approximately 867. About an hour later, he was found dead in his room from a self-inflicted gunshot wound. - Wikipedia

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Multiple rifles (semi-automatic), bump stocks reported

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America's Deadliest Mass Shooting - Forgotten History

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On June 12, 2016, 29-year-old Omar Mateen shot and killed 49 people and wounded 53 more in a mass shooting at Pulse, a gay nightclub in Orlando, Florida, United States. Pulse was hosting a "Latin Night", and most of the victims were of Latino descent. - Wikipedia

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Handgun(s); one rifle reported in some accounts

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Orlando Nightclub Massacre: A Timeline of What Happened

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Stoneman Douglas High School, Parkland, FL

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Stoneman Douglas High School, Parkland, FL

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On February 14, 2018, a mass shooting occurred when 19-year-old Nikolas Cruz opened fire on students and staff at Marjory Stoneman Douglas High School, part of the Miami metropolitan area, Parkland, Florida, killing 17 people[note 2] and injuring 18 others.[4][5][6] Cruz, a former student at the school, fled the scene on foot by blending in with other students and was arrested without incident approximately one hour and twenty minutes later in nearby Coral Springs. - Wikipedia

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Parkland shooting: 5 years since shooting at Marjory Stoneman Douglas High School that killed 17

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Inside the Uvalde Response | FRONTLINE + @ProPublica + @texastribune

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The Uvalde school shooting was a mass shooting on May 24, 2022, at Robb Elementary School in Uvalde, Texas, United States, where 18-year-old Salvador Ramos, a former student at the school, fatally shot 19 students and 2 teachers, while injuring 17 others. Ramos was killed 74 minutes after entering the classroom by law enforcement officers.

It is the third deadliest shooting at an American school after the Virginia Tech shooting in 2007 and the Sandy Hook Elementary School shooting in 2012 and the deadliest school shooting in Texas. After shooting and wounding his grandmother at their home, Ramos drove to Robb Elementary School, where he entered a classroom and shot his victims, having bypassed local and state officers who had been in the hallways.

He remained in the classrooms for 1 hour and 14 minutes before members of the United States Border Patrol Tactical Unit breached the classroom and fatally shot him. Police officers did not breach the classroom,but cordoned off the school grounds, resulting in violent conflicts between police and civilians, including parents, who were attempting to enter the school to rescue children. As a consequence, law enforcement officials in Uvalde were criticized for their response, and their conduct was reviewed in separate investigations by the Texas Ranger Division and United States Department of Justice. - Wikipedia

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Inside the Uvalde Response (full documentary) | FRONTLINE + @ProPublica + @texastribune

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On August 3, 2019, a mass shooting occurred at a Walmart store in El Paso, Texas, United States. The gunman, 21-year-old Patrick Wood Crusius, shot 45 people, killing 23 and injuring 22 others.The Federal Bureau of Investigation investigated the shooting as an act of domestic terrorism and a hate crime. The shooting has been described as the deadliest attack on Latinos in modern American history. - Wikipedia

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Texas Walmart shooter pleads guilty and sentenced to life in prison

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On December 2, 2015, an Islamic terrorist attack, consisting of a mass shooting and an attempted bombing, occurred at the Inland Regional Center in San Bernardino, California, United States.

The perpetrators, Syed Rizwan Farook and Tashfeen Malik, a married couple living in the city of Redlands, targeted a San Bernardino County Department of Public Health training event and Christmas party of about 80 employees in a rented banquet room.

Fourteen people were killed and 22 others were seriously injured. Farook was a Muslim and an American-born citizen of Pakistani descent, who worked as a health department employee. Malik was a Muslim and Pakistani-born green card holder.

After the shooting, the couple fled in a rented Ford Expedition SUV. Four hours later, police pursued their vehicle and killed them in a shootout, which also left two officers injured.

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Assault rifles and handguns; explosives reported

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Timeline for San Bernardino mass shooting

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On July 20, 2012, a mass shooting occurred inside a Century 16 movie theater in Aurora, Colorado, United States, during a midnight screening of the film The Dark Knight Rises. Dressed in tactical clothing, 24-year-old James Eagan Holmes set off tear gas grenades and shot into the audience with multiple firearms. Twelve people, as well as an unborn baby, were killed and 70 others were injured, 58 of them due to gunfire. - Wikipedia

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Rifle, shotgun, handgun; gas canisters reported

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Remembering the Aurora movie theater shooting victims

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Sandy Hook Elementary School, Newtown, CT

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Sandy Hook Elementary School, Newtown, CT

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On December 14, 2012, a mass shooting occurred at Sandy Hook Elementary School in Newtown, Connecticut, United States. The perpetrator, 20-year-old Adam Lanza, shot and killed 26 people. The victims were 20 children between six and seven years old, and 6 adult staff members. Earlier that day, before driving to the school, Lanza fatally shot his mother at their Newtown home. As first responders arrived at the school, Lanza killed himself with a gunshot to the head. - Wikipedia

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Rifles and handguns (from mother's collection)

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Sandy Hook Elementary Shooting: Gunman Adam Lanza Got Guns From Mother

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An anti-black mass shooting and hate crime occurred on June 17, 2015, in Charleston, South Carolina. Nine people were killed during a Bible study at Emanuel African Methodist Episcopal Church, the oldest black church in the Southern United States. Among the fatalities was the senior pastor, state senator Clementa C. Pinckney. All nine victims were African Americans. At the time, it was one of the deadliest mass shootings at a place of worship in U.S. history, tied with the Waddell Buddhist temple shooting. Both incidents were surpassed by the Sutherland Springs church shooting in 2017. - Wikipedia

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On November 7, 2018, a mass shooting occurred in Thousand Oaks, California, United States, at the Borderline Bar and Grill, a country-western bar frequented by college students.

Thirteen people were killed, including the perpetrator, who died of a self-inflicted gunshot wound, and a police officer who was shot multiple times, with the fatal round accidentally being fired by another officer.

One other person sustained a gunshot wound, while fifteen others were injured by incidental causes. Wikipedia

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What do we know about California bar shooting suspect?

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On January 21, 2023, a mass shooting occurred in Monterey Park, California, United States. The gunman killed eleven people and injured nine others.[5] The shooting happened at about 10:22 p.m. at Star Ballroom Dance Studio, after an all-day Lunar New Year Festival was held on a nearby street.

Shortly afterwards, the gunman drove north to Lai Lai Ballroom in nearby Alhambra to continue his shooting spree but was confronted by staff and disarmed before fleeing by car. The perpetrator was identified as 72-year-old Huu Can Tran.

He died from a self-inflicted gunshot wound during a standoff with police in Torrance the next day. It is the deadliest mass shooting in the history of Los Angeles County.[10]

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10 shot, 10 wounded at dance studio in Monterey Park, California

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On May 31, 2019, a mass shooting occurred at a municipal building in the Princess Anne area of Virginia Beach, Virginia. The gunman, DeWayne Craddock, who was a disgruntled city employee, fatally shot 12 people and wounded four others before he was killed by responding police officers. It is the second-deadliest workplace shooting in U.S. history after the 1986 Edmond post office shooting and the deadliest mass shooting in Virginia since the 2007 Virginia Tech shooting.

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‘The gunman was right there’: The Virginia Beach shooting through the eyes of a survivor

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Columbine High School massacre, Littleton, CO

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Columbine High School massacre, Littleton, CO

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The Columbine High School massacre was a school shooting and attempted bombing that occurred at Columbine High School in Columbine, Colorado, United States on April 20th, 1999.

The perpetrators, twelfth-grade students Eric Harris and Dylan Klebold, murdered 13 students and one teacher; ten were killed in the school library, where Harris and Klebold subsequently died by suicide.

Twenty additional people were injured by gunshots, and gunfire was exchanged several times with law enforcement with neither side being struck. Another three people were injured trying to escape. The Columbine massacre was the deadliest mass shooting at a K-12 school in U.S. history until December 2012. It is still considered one of the most infamous massacres in the United States, for inspiring many other school shootings and bombings; the word Columbine has since become a byword for modern school shootings.

As of 2025, Columbine remains both the deadliest mass shooting and school shooting in Colorado, and one of the deadliest mass shootings in the United States.

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Firearms and homemade explosives (shotguns, pistols)

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Uncovering The Tragedy At Columbine High: A Mass Shooting Documentary | Real Crime

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Santa Fe High School shooting, Santa Fe, TX

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Santa Fe High School shooting, Santa Fe, TX

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On May 18, 2018, a school shooting occurred at Santa Fe High School in Santa Fe, Texas, United States, in the Houston metropolitan area. Ten people – eight students and two teachers – were fatally shot, and thirteen others were wounded.

Dimitrios Pagourtzis, a 17-year-old student at the school, was taken into custody. The shooting is the eighth-deadliest school shooting in the United States. - Wikipedia

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2018 Santa Fe High School Shooting [Dimitrios Pagourtzis]

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On May 18, 2018, a school shooting occurred at Santa Fe High School in Santa Fe, Texas, United States, in the Houston metropolitan area. Ten people – eight students and two teachers – were fatally shot, and thirteen others were wounded.

Dimitrios Pagourtzis, a 17-year-old student at the school, was taken into custody. The shooting is the eighth-deadliest school shooting in the United States. - Wikipedia

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Pittsburgh Tree of Life synagogue shooting, Pittsburgh, PA

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Pittsburgh Tree of Life synagogue shooting, Pittsburgh, PA

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On October 27, 2018, a man attacked Tree of Life – Or L'Simcha Congregation synagogue in the Squirrel Hill neighborhood of Pittsburgh, Pennsylvania.

The congregation, along with New Light Congregation and Congregation Dor Hadash, which also worshipped in the building, was attacked during Shabbat morning services. The perpetrator killed eleven people and wounded six, in the deadliest attack on a local Jewish community in American history.

The perpetrator, 46-year-old Robert Gregory Bowers, was shot multiple times by police and arrested at the scene.

Bowers had earlier posted antisemitic comments against HIAS (formerly, Hebrew Immigrant Aid Society) on the online alt-tech social network Gab. Dor Hadash had participated in HIAS's National Refugee Shabbat the previous week. Referring to Central American migrant caravans and immigrants,

Bowers posted a message on Gab in which he wrote that "HIAS likes to bring invaders in that kill our people. I can't sit by and watch my people get slaughtered. Screw your optics, I'm going in."

He was charged with 63 federal crimes, some of them capital crimes. Bowers pleaded not guilty. In 2023, he was found guilty on all counts and sentenced to death by lethal injection. - Wikipedia

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Pittsburgh Tree of Life synagogue shooting

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AR-15 style rifle and handguns (reported)

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Jury reaches verdict in 2018 Pittsburgh Tree of Life synagogue shooting

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On August 4, 2019, 24-year-old Connor Betts shot and killed nine people, including his brother,[a] and wounded 17 others near the entrance of the Ned Peppers Bar in the Oregon District of Dayton, Ohio, United States.[3][6][7] Betts was fatally shot by responding police officers 32 seconds after the first shots were fired.[3][8] A total of 27 people were taken to area hospitals.[8] It is the deadliest mass shooting to occur in Ohio since the 1975 Easter Sunday Massacre. - Wikipedia

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Handgun(s); body armor; high-capacity magazines

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The Luby's shooting, also known as the Luby's massacre, was a mass shooting that took place on October 16, 1991 at a Luby's Cafeteria in Killeen, Texas, United States. The perpetrator, George Hennard, drove his pickup truck through the front window of the cafeteria before opening fire, killing 23 people and wounding 27 others. He had a brief shootout with police officers in which he was seriously wounded but refused their orders to surrender and eventually died by suicide. - Wikipedia

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9mm Glock 17 and Ruger P89 (handguns); vehicle used to ram storefront

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The Luby’s Massacre: Inside the 1991 Texas Shooting

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The San Ysidro McDonald's massacre was an act of mass murder, which occurred at a McDonald's restaurant in the San Ysidro neighborhood of San Diego, California, on July 18, 1984.

The perpetrator, 41-year-old James Huberty, fatally shot 22 people, including an unborn baby, and wounded 19 others before being killed by a police sniper approximately 77 minutes after he had first opened fire.

At the time, the massacre was the deadliest mass shooting by a lone gunman in U.S. history, being surpassed seven years later by the Luby's shooting. It remains the deadliest mass shooting in California. - Wikipedia

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9mm Browning HP; 9mm Uzi carbine; 12-gauge Winchester 1200 shotgun

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The McDonald's Massacre: A Tragedy That Changed America Forever

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University of Texas tower shooting, Austin, TX

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University of Texas tower shooting, Austin, TX

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The University of Texas tower shooting was an act of mass murder that occurred on August 1, 1966, at the University of Texas at Austin.

The perpetrator, 25-year-old Marine veteran Charles Whitman, indiscriminately fired at members of the public, both within the Main Building tower and from the tower's observation deck. Whitman shot and killed 15 people, including an unborn child, and injured 31 others before he was killed by two Austin Police Department officers approximately 96 minutes after first opening fire from the observation deck.

Prior to arriving at the University of Texas, Whitman had stabbed his mother and wife to death—in part to spare both women "the embarrassment" he believed his actions would cause them. Although Whitman's autopsy revealed a pecan-sized tumor in the white matter above his amygdala, the tumor was not connected to any sensory nerves.

Nonetheless, some experts believe this tumor may have contributed to the violent impulses which Whitman had been exhibiting for several years prior to the massacre. - Wikipedia

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University of Texas tower shooting (Main Building, UT Austin)

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Rifles and handguns (including Remington 700)