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.

Orlando shooting: Rifle used in shooting drives US gun control debate

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.