Police on Thursday were investigating a shooting that left one man dead and three other people wounded shortly before a concert by rapper T.I. in Manhattan.

The shooting started Wednesday night as an argument broke out between rival groups associated with rappers Maino and Troy Ave, according to reports.

Maino and another rapper, Uncle Murda, were performing before an audience of about 1,000 at the Irving Plaza club near Union Square when gunfire erupted at about 10:15 p.m., according to reports.

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The gunman and the victims were all credentialed guests with access to the VIP area, a source said told the New York Daily News. No arrests have been made, police said.

Police Commissioner Bill Bratton told a local radio station on Thursday that police believe they will wrap up the investigation quickly. "We have a pretty good idea of what happened," Bratton said.

A 33-year-old man was shot in the stomach, a 26-year-old woman was wounded in the leg, a 34-year-old man was shot in the chest and a 30-year-old man was wounded in the leg, police said. None of the victims were identified.

The man shot in the stomach was pronounced dead at a local hospital, police said. Two of the three others wounded were taken to local hospitals and were in stable condition.

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A video clip posted on Twitter showed dozens of people screaming and rushing away from the stage. They fell to the ground as shots rang out.

In 2015, two people were wounded in a shooting at a North Carolina nightclub also featuring rapper T.I.

Bratton told the radio station that violence is often part of the world of rap artists and music. "Unfortunately that violence oftentimes manifests itself during performances and that's exactly what happened last evening," he said.

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