 Complete the following phrase:  Mateen took hostages after police arrived and engaged in a gunfight with him. At approximately 5:00 a.m., police shot and killed Mateen, ending the shooting. A total of 49 people were left dead along with Mateen, and 53 others were injured. Mateen was reported to have fired at least 110 rounds during the entire event. The attack was the deadliest known incident of violence against LGBT people in U.S. history and the deadliest mass shooting by a single gunman in the United States until the 