A gunman killed 49 people at a packed gay nightclub in Orlando, Florida on Sunday in the worst mass shooting in US history, an attack that was later claimed by the Islamic State (IS) group.

Obama on Orlando shooting: "we work to succeed 100% of time but attacker need only succeed once"

A gunman killed 49 people at a packed gay nightclub in Orlando, Florida on Sunday in the worst mass shooting in US history, an attack that was later claimed by the Islamic State (IS) group.