Sources tell NY1 that police have found the gun that was used in last week's deadly shooting at Irving Plaza at a T.I. concert.

Sources say the weapon, along with other guns, were found inside a secret compartment in a vehicle connected to rapper Troy Ave. Those other guns are being tested to see if they're connected to any other shootings, according to sources.

The 33-year old, whose real name is Roland Collins, was arraigned Monday on attempted murder and criminal weapons possession charges.  

Police say surveillance video shows Troy Ave firing shots in a green room before the rapper T.I. was set to take the stage last Wednesday.

A member of Troy Ave's security team, Ronald McPhatter, was killed.

The victim's brother, Shanduke McPhatter, blames the club's security staff for what happened.

"I was aware of the ongoing beef that was happening with Troy Ave and the other individual. I would not have let those two gentlemen in the club if the security staff was trained," Shanduke McPhatter said.

Two other people were also shot, but they survived.

Troy Ave is due back in court June 9.