Attorney general visiting Orlando in wake of deadly attack

Ronald Hopper, FBI assistant special agent in charge, right, speaks during a news conference with updates about the recent mass shooting at the Pulse nightclub, Monday, June 20, 2016, in Orlando, Fla. Orlando gunman Omar Mateen identified himself as an Islamic soldier in calls with authorities during his rampage and demanded to a crisis negotiator that the U.S. "stop bombing Syria and Iraq," according to transcripts released by the FBI on Monday. (AP Photo/John Raoux)

ORLANDO, Fla. - Attorney General Loretta Lynch is visiting Orlando to meet with prosecutors, first responders and families of the victims of the worst mass shooting in modern U.S. history.

The trip Tuesday comes as the Justice Department continues investigating the June 12 massacre at the Pulse nightclub, in which 49 people died and dozens were wounded. Federal investigators who have conducted hundreds of interviews haven't ruled out charges against others in connection with the shooting and say they're still trying to determine why Omar Mateen, who died in a gun battle with police, picked as his target a popular gay nightclub.

More clues emerged Monday when the FBI released a partial transcript of phone calls Mateen had with a 911 operator and police crisis negotiators once the shooting got underway.