I'm not sure if many people are aware that there was a totally separate and unrelated fatal shooting after a concert only the night previously in Orlando, Florida only about four miles from the Pulse shooting. The victim was a 22 year old ex-contestant of The Voice who had just performed at the concert. Certainly nothing to suggest that this was Islam / ISIS related. If it hadn't been for the victim's brother tackling the gunman this incident could easily have also turned into a mass shooting / murder as the gunman was carrying two handguns and a hunting knife.
http://www.bbc.co.uk/news/world-us-canada-36507546
http://www.bbc.co.uk/news/world-us-canada-36507546