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

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.

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

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]

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.

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

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

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

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

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

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