50 dead as Florida nightclub massacre becomes America’s worst ever mass shooting

Latest: Omar Mateen was said to have been known to the FBI before the nightclub attack and had been looked at by agents within the last few years.

• 50 are confirmed dead
• Omar Mateen named as shooter
• Mateen was known to FBI
• Unconfirmed reports that Islamic State has claimed responsibility
• US president Barack Obama has said the nightclub shooting in Orlando was an "act of terror" and an "act of hate"

Update 8.50pm: Omar Mateen was said to have been known to the FBI before the nightclub attack and had been looked at by agents within the last few years.