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A crowd gathers behind police line near the scene of a shooting on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away.  AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN        (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
A crowd gathers behind police line near the scene of a shooting on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away.  AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN        (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)

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The deadliest U.S. shootings of 2015

Between public mass shootings and domestic violence incidents, these are some of the deadliest shootings of the last year.

The deadliest U.S. shootings of 2015

Between public mass shootings and domestic violence incidents, these are some of the deadliest shootings of the last year.