(REUTERS)  The gunman who slaughtered 49 people at a gay nightclub in Florida said he had a car rigged with bombs outside and threatened to strap hostages into explosive vests, according to partial transcripts of 911 calls he made released on Monday. Omar Mateen, 29, paused during a three-hour siege to telephone emergency dispatchers three times and to post internet messages from inside the Pulse nightclub professing his support for Islamist militant groups. “You […]