'He is gonna try to kill cops': 911 calls reveal the terror of Orlando nightclub shooting

By 3:20 a.m. on June 12, officers had figured out the gunman in Orlando's Pulse nightclub was Omar Mateen and were dialing his cellphone repeatedly. Most of the time, he didn't pick up.

When a negotiator who called himself "Officer Andy" dialed and redialed, he and another police officer talked...