Omar Mateen, 29, of Port St. Lucie, Florida, has been identified as the gunman who opened fire at Pulse nightclub in Orlando in what is now the worst mass shooting in U.S. history. (Courtesy: MySpace)

Orlando nightclub massacre: Who is gunman Omar Mateen?

Omar Mateen, of Port St. Lucie, Florida, has been identified as the gunman who opened fire at a nightclub in Orlando. Forty-nine people were…

Police cars surround the Pulse Orlando nightclub, the scene of a fatal shooting, in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)

#PrayForOrlando: Social media reacts to worst mass shooting in US history

Fifty people were killed and 53 more injured in a shooting early Sunday morning at Pulse nightclub in Orlando in what is now the worst mass …

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The Latest: People gather across US to honor Orlando victims

People are gathering at vigils honoring the victims of a shooting attack in Orlando that left 50 people dead and 53 wounded.

(Photo courtesy of John Whalen/Huntington Ingalls Industries)

NNS turns around Gerald R. Ford

Shipbuilders, sailors and five tugboat crews worked together for about two hours to turn the aircraft carrier 180 degrees.