PICTURED: The grim scene at bullet-riddled Orlando nightclub

A series of photos shows the devastating scene left after Omar Mateen opened fire inside an Orlando gay night club killing 50 innocent people and injuring dozens more.

Mateen, who is the worst mass shooter in American history, shot more than 100 people with an AR-15 assault rifle and handgun on the dance floor at Pulse night club early Sunday morning.

The gunman exchanged gunfire with an officer working around the club at 2am before going back inside, according to Orlando Police Chief John Minia.

Writing on Facebook, Pulse, which described itself as the most prominent gay club in Orlando, urged party-goers to ‘get out and keep running’ as bullets started to fly.

Pulse Nightclub