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TOPSHOT - FBI agents are collecting evidence at the home of suspected nightclub shooter Ian David Long in Thousand Oaks, northwest of Los Angeles, on November 8, 2018. - The gunman who killed 12 people in a crowded California country music bar has been identified as 28-year-old Ian David Long, a former Marine, the local sheriff said Thursday November 8, 2018. The suspect, who was armed with a .45-caliber handgun, was found deceased at the Borderline Bar and Grill, the scene of the shooting in the city of Thousand Oaks northwest of downtown Los Angeles. (Photo by Apu Gomes / AFP)APU GOMES/AFP/Getty Images
FBI reveals keys to spotting a mass shooter before an attack

The FBI report identified ways to identify mass shooters before they strike. Historical data shows there's an uptick in US mass shootings in early July.

02:26 - Source: CNN
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