LIVE BLOG: At least 50 killed in possible act of Islamic terror at Orlando nightclub

Officials hold press conference on nightclub attack that left 50 people dead


Below are live updates from the investigation into the Orlando nightclub massacre and gunman Omar Mateen.

Police said the shooter, wielding an assault-type rifle, opened fire inside the crowded Pulse Nightclub early Sunday, killing dozens of people before officers shot and killed him. It was the deadliest mass shooting in U.S. history.