Ex-wife claims Orlando gunman was 'mentally ill and abusive'

Gunman Omar Mateen, who killed at least 50 people in a gay nightclub in Florida, was mentally unstable and had a history of using steroids, his ex-wife said.

The 29-year-old, who wielded an assault-type rifle and a handgun, opened fire inside Pulse, in Orlando, spraying clubbers with bullets in the deadliest mass shooting in modern US history.