Omar Mateen identified himself to a 911 operator as the shooter at the Pulse nightclub about a half hour after the massacre started and he pledged allegiance to the Islamic State group.
"I want to let you know I'm in Orlando and I did the shooting," he said.
When a police negotiator called him back about a dozen minutes later, Mateen told the negotiator he needed to stop the US airstrikes in Syria and Iraq. A U led coalition has targeted Islamic State militants with airstrikes in those two countries.
Mateen also compared himself to Boston Marathon bomber Tamerlan Tsarnaev, according to the transcripts. Three people were killed and more than 260 were injured when two bombs exploded at the marathon's finish line in 2013.
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"My homeboy Tamerlan Tsarnaev did his thing on the Boston Marathon," Mateen said. "So, now it's my turn, OK?" Mateen told the negotiator that he had fasted and prayed all day since it was the Muslim holiday, Ramadan.
This week, the city of Orlando has made public dozens of 911 calls, as well as the transcripts of three conversations Mateen had with police negotiators, after fighting with media groups seeking their release.
A hearing is being held today on the litigation between the city and two dozen media groups, including The Associated Press.
The June 12 nightclub attack claimed 49 lives and seriously injured 53 others.
The city had said the records were exempt from the state's public records law, both because they were part of an investigation and because some were graphic calls of patrons being shot and killed.
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