The grim scene at bullet-riddled Orlando gay nightclub where 49 revellers were massacred by ISIS fanatic before SWAT team smashed down a wall and shot him dead

A series of photos shows the devastating scene left after Omar Mateen, who was shot dead by authorities, 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. Photos taken both on the ground and overhead show forensic investigators at the scene working to piece together exactly what happened.