Go to Drudge Report. Link to UK story in which states shooter called 911 and pledged allegiance to ISIS.
MSNBC also reporting he called 911 to pledge ISIS allegiance.
A another note, has President Obama made any statement condemning the attack yet?
See:
FBI learned of him in 2013 after he made inflammatory remarks to coworkers and alleged terrorist ties, said FBI Special Agent In Charge Ron Hopper.
The FBI investigated and interviewed witnesses and Mateen, but closed the investigation. He came to the FBI’s attention again in 2014 for making contact with a suicide bomber. FBI determined their connection was minimal and closed the investigated
U.S. Senator Bill Nelson, D-Florida, said the Islamic State claimed responsibility for a massacre at an Orlando gay nightclub that left 50 dead and 53 injured, the deadliest shooting in U.S. history.
http://www.orlandosentinel.com/news/breaking-news/os-orlando-shooting-pulse-nightclub-story.html