Six of the 10 deadliest mass shootings in modern U.S. history have occurred since 2012.

A list of some of the deadliest mass shootings:

— Oct. 1, 2017: Stephen Paddock opened fire on an outdoor music festival on the Las Vegas Strip from the 32nd floor of a hotel-casino, killing 58 people and wounding more than 500. SWAT teams with explosives then stormed his room and found he had killed himself.

— June 12, 2016: Omar Mateen opened fire at an Orlando, Florida, nightclub, killing 49 people. Mateen was later killed in a shootout with police.

— April 16, 2007: Virginia Tech student Seung-Hui Cho shot and killed 32 people and wounded 17 others in separate attacks on campus before killing himself.

— Dec. 14, 2012: In Newtown, Connecticut, an armed 20-year-old man entered Sandy Hook Elementary School and used a semi-automatic rifle to kill 26 people, including 20 first-graders and six adult school staff members. He then killed himself.

— Nov. 5, 2017: Devin Patrick Kelley, who had been discharged from the Air Force after a conviction for domestic violence, used an AR-style firearm to shoot up a congregation at a small church in Sutherland Springs, Texas, killing more than two dozen.

— Oct. 16, 1991: George Hennard drove his pickup truck though the front window of Luby's restaurant in Killeen, Texas, and then fatally shot 23 people, wounded 27 others and then killed himself after a shootout with police.

— July 18, 1984: James Huberty drove to a McDonald's in the San Ysidro neighborhood of San Diego, California, armed with an Uzi submachine gun, a shotgun and a handgun. He shot and killed 21 people, injured 19 and then was killed by a police sniper.

— Feb. 14, 2018: Nikolas Cruz shot and killed 17 students and staff members at Marjory Stoneman Douglas High School in Parkland, Florida. It surpassed Columbine High School as the deadliest shooting at a high school in U.S. history.

— Dec. 2, 2015: Syed Rizwan Farook, 28, and Tashfeen Malik, 27, opened fire at a social services center in San Bernardino, California, killing 14 people and wounding more than 20. They fled the scene but died hours later in a shootout with police.

— Aug. 20, 1986: Postal worker Patrick Sherrill shot 20 co-workers, killing 14 of them, in Edmond, Oklahoma. He then committed suicide.

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