"High-capacity ammunition magazines are the common thread that runs through most mass shootings: giving attackers the ability to fire numerous bullets without reloading.... Here are just 10 of the U.S. mass shootings that involved high-capacity ammunition magazines. 1. Hartford Distributors On August 3, 2010, concealed handgun permit holder Omar Thornton, armed with a Sturm, Ruger SR9 semi-automatic pistol and high-capacity ammunition magazine, opened fire on his co-workers at beer distributor Hartford Distributors in Manchester, CT, killing eight and wounding two before taking his own life. 2. Fort Hood On November 5, 2009, Nidal Hasan, armed with an FN 5.7 semi-automatic pistol and 30- and 20-round high-capacity ammunition magazines, killed 13 and wounded more than 30 at the Fort Hood military base in Fort Hood, TX. 3. Virginia Tech On April 16, 2007, Seung-Hui Cho, armed with a Glock 19 semi-automatic pistol, Walther P22 semi-automatic pistol, and 15-round high-capacity ammunition magazines, killed 32 and wounded 17 on the campus of Virginia Tech in Blacksburg, VA, before taking his own life. 4. Xerox Office Building On November 2, 1999, Byran Uyesugi, armed with a Glock 17 semi-automatic pistol and three 15-round high-capacity magazines, opened fire at the Xerox Office Building in Honolulu, HA, killing seven. 5. Wedgewood Baptist Church On September 15, 1999, Larry Gene Ashbrook, armed with a Sturm, Ruger P85 9mm semi-automatic pistol and three 15-round high-capacity magazines, opened fire at Wedgewood Baptist Church, killing seven and wounding seven before taking his own life. 6. Columbine On April 20, 1999, Eric Harris and Dylan Klebold, armed with an Intratec TEC-DC9 semi-automatic assault pistol, Hi-Point 9mm semi-automatic Carbine, two Savage shotguns, and high-capacity ammunition magazines, killed 13 and wounded 23 at Columbine High School in Littleton, CO, before taking their own lives. 7. Long Island Railroad On December 7, 1993, Colin Ferguson, armed with a Sturm, Ruger P89 9mm semi-automatic pistol and four 15-round high-capacity ammunition magazines, opened fire on Long Island Railroad commuters, killing six and wounding 19. 8. Pettit & Martin, 101 California On July 1, 1993, Gian Luigi Ferri, armed with two Intratec TEC-DC9 semi-automatic assault pistols, a 45 caliber semi-automatic pistol, and 40- to 50-round high-capacity ammunition magazines, opened fire at the San Francisco, CA, law firm of Pettit & Martin, killing eight and and wounding six before taking his own life. 9. Luby's Cafeteria On October 16, 1991, George Hennard, armed with a Sturm, Ruger P89 semi-automatic pistol, Glock 9mm semi-automatic pistol, and 17- and 15-round magazines, killed 23 and wounded 20 at Luby's Cafeteria in Killeen, TX, before taking his own life. 10. Stockton On January 17, 1989, Patrick Purdy, armed with an AK-47 semi-automatic assault rifle, Taurus 9mm semi-automatic pistol, an unidentified semi-automatic pistol, and a 75-round high-capacity drum magazine, opened fire on grade school children at Cleveland Elementary School in Stockton, CA, killing five and wounding 30 before taking his own life."