|The killer has been named as Omar Mateen, pictured, who is responsible for the murder of some 50 people|
ISIS claimed they were going to attack Florida three days before a fanatic armed with an AR-15 assault shot dead at least 50 people in a gay nightclub, according to twitter feeds supporting the terror group.
Security services in Florida have confirmed the killer is 29-year-old Omar Mateen, a US-born citizen with Afghan parents.
Several ISIS-linked Twitter accounts have praised Mateen's actions, although there has been no official claim of responsibility from the group.
|Twitter followers of ISIS have been gloating online about the massacre which killed 50 people|