attacked the Virginia Beach Municipal Center, killing 12 people.

A gunman entered the Borderline Bar & Grill, a country music bar, and shot a security guard at the entrance with a .45-caliber handgun before opening fire into the crowd, killing 12 people. The gunman was found dead at the scene after being confronted by officers who had stormed the bar.

killing 11 congregants and wounding six others. The gunman shot indiscriminately at worshipers for several minutes.

A man armed with a shotgun and smoke grenades assaulted the newsroom of a community newspaper chain in Annapolis, Md., killing five staff members, injuring two others. The gunman had previously sued journalists at the chain, the Capital Gazette, for defamation and had waged a social media campaign against them.

Armed with a shotgun and a .38 revolver hidden under his coat, a 17-year-old student opened fire on his high school campus, Santa Fe High School, killing 10 people, many of them his fellow students, and wounding 10 more, the authorities said. Witnesses said that the gunman first entered an art classroom, said “Surprise!” and started shooting.

a wave of nationwide, student-led protests calling on lawmakers to tighten gun laws.

A gunman with a ballistic vest strapped to his chest and a military-style rifle in his hands stormed into a Sunday church service at a small Baptist church in rural Texas and sprayed bullets into its pews. He killed 26 people, including nine members of a single family, and left 20 people wounded, many of them severely. The gunman later shot himself.

deadliest mass shootings in American history, a gunman perched on the 32nd floor of the Mandalay Bay Resort and Casino, smashed the windows of his suite with a hammer and shot at a crowd of 22,000 people at an outdoor country music festival. Fifty-eight people were killed and 887 sustained documented injuries, either from gunfire or while running to safety.

As an airline passenger retrieved his checked luggage, he pulled a 9-millimeter handgun out of his suitcase and used it to kill five people and wound six others at Fort Lauderdale-Hollywood International Airport in Florida. When he ran out of ammunition, he lay on the floor, waiting to be arrested.

A heavily armed sniper targeted police officers in downtown Dallas, leaving five of them dead. The gunman turned a demonstration against fatal police shootings of Black men in Minnesota and Louisiana from a peaceful march focused on violence committed by officers into a scene of chaos and bloodshed.

killing 50 people and wounding 53 others. After a three-hour standoff following the initial assault, law enforcement officials raided the club and fatally shot the gunman.

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