gettyimagesFORT PIERCE, FL - JUNE 12: Law enforcement officials gather on the street in front of the apartment building where shooting suspect Omar Mateen is believed to have lived on June 12, 2016 in Fort Pierce, Florida. The mass shooting at Pulse nightclub in Orlando, Florida killed at least 50 people and injured 53 others in what is the deadliest mass shooting in the country's history. (Photo by Joe Raedle/Getty Images)