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.

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Doctors fear the death toll from the deadliest mass shooting in US history will rise, as the identities of the 50 people who were gunned down began to emerge.