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Members of the FBI and other investigators work in the area around the Pulse nightclub June 13, 2016 in Orlando, Florida.
Forty-nine people died and more than 50 were injured early June 12 when a heavily-armed gunman opened fire and seized hostages at a gay nightclub in Orlando, Florida, in the worst mass shooting in US history. / AFP / Brendan Smialowski        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Members of the FBI and other investigators work in the area around the Pulse nightclub June 13, 2016 in Orlando, Florida.
Forty-nine people died and more than 50 were injured early June 12 when a heavily-armed gunman opened fire and seized hostages at a gay nightclub in Orlando, Florida, in the worst mass shooting in US history. / AFP / Brendan Smialowski        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

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    FBI: Gunman called 911 three times during attack

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FBI: Gunman called 911 three times during attack

FBI director James Comey says the gunman in the Orlando shooting called 911 three times during the attack.

FBI: Gunman called 911 three times during attack

FBI director James Comey says the gunman in the Orlando shooting called 911 three times during the attack.