Brooklyn rapper Troy Ave has been arrested in connection with a fatal shooting at the Irving Plaza concert hall. Police Commissioner William Bratton announced the arrest during a taping of NY1's "Inside City Hall." NY1's Dean Meminger ifled hte following report.

Police say Brooklyn rapper Troy Ave is the one squeezing off shots in surveillance footage taken from inside Irving Plaza Wednesday night.

The rapper's real name is Roland Collins. He's been arrested and charged with attempted murder and weapons possession.

"I described him as a thug, and a thug basically, in my parlance, is a violent person, a criminal, and quite clearly, we saw a violent person there," said Police Commissioner William Bratton.

In the video, you can see that Troy Ave is limping. He was shot in the leg, but it's unclear by whom.

They also want to know who shot and killed Ronald McPhatter, a member of Troy Ave's security team. McPhatter appears to be running past the rapper in the video.

Two other people were shot but survived.

"It looked like, from what we can determine right now from witnesses and video, a fisticuffs broke out, and then gun played directly thereafter. It went on for about five minutes, the fight, and then someone pulled a gun," said NYPD Chief of Detectives Robert Boyce.

Rappers T.I., Uncle Murda and Maino were set to perform at Irving Plaza but hadn't hit the stage when the chaos broke out.

Police say it doesn't appear that T.I. was involved.

The NYPD is also investigating any beefs the rappers may have had with each other prior to Wednesday's shooting.

In a statement, Maino said he did not have problems with any of the artists. (His full statement can be read below.)

The police commissioner caused some controversy by blasting those who rap about violence.

"The gangster rap world, if you will, that celebrates denigration of women, celebrates violence, celebrates anti-cop language, certainly nothing I don't think anybody should be proud of in terms of the language to choose," Bratton said.

Meantime, McPhatter's mother and his brother, a Brooklyn anti-violence activist, traveled to Irving Plaza asking for answers from the NYPD and the club.

"I need to know who was on staff and how they got in there with them guns. Accountability," said Shanduke McPhatter, the victim's brother.

Activists and the family members say they're calling for peace and not retaliation.