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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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Orlando terrorist subject of failed FBI sting operation

Three FBI interviews and an undercover probe weren't enough to raise new red flags that might've prevented the Orlando massacre. CNN's Evan Perez reports.

Orlando terrorist subject of failed FBI sting operation

Three FBI interviews and an undercover probe weren't enough to raise new red flags that might've prevented the Orlando massacre. CNN's Evan Perez reports.