Worst Terror Attack in U.S. History since 9/11
A nightclub in Orlando was the scene early Sunday of the worst terror attack in U.S. history since 9/11.
* 50 people were killed inside the Pulse club and at least 53 people injured, police say.
* The gunman was Omar Mateen of Ft. Pierce, Florida, source told CNN.
* Orlando police shot and killed Mateen
* Mateen called 911 around the time of the attack to pledge allegiance to ISIS and mention the Boston bombers, according to a U.S. official.
"It appears he was organized and well-prepared," Orlando Police Chief John Mina said early Sunday. The shooter had an assault-type weapon, a handgun and "some type of (other) device on him."
There has been no claim of responsibility for the attack on jihadi forums, but ISIS sympathizers have reacted by praising the attack on pro-Islamic State forums.
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