Omar Mateen drove around Orlando the night before the nightclub massacre, visiting several places, the mayor said.

Orlando mayor Buddy Dyer has said he is uplifted by the way the community has come together during a city-wide prayer service for the 49 people who were killed in a nightclub shooting.

Omar Mateen was a bodybuilder and a security guard, a religious man who attended the local mosque and wanted to become a police officer.

Gunman Omar Mateen, who killed at least 50 people in a gay nightclub in Florida, was mentally unstable and had a history of using steroids, his ex-wife said.