50 Cent is reportedly being investigated as part of an alleged robbery that occurred during a recent concert.

A man claimed he was robbed of his chain at the Hot 97 Summer Jam in New Jersey, where the rapper performed last Sunday.

The victim, who goes by the name Slow, held a press conference in New York City on Thursday to discuss the alleged incident with civil investigator, John P. Bostany, who asserts the robbery took place on stage when 50 was performing with rapper Fabolous.

AllHipHop.com reports Bostany discussed his plans to investigate all parties he believes could have been involved, including 50.

“If you look at the videos, every single one, whether [50 Cent is] the one picking up the chain or not is irrelevant,” he was quoted as saying. “His body is facing what’s going on and then he turns around, in the middle of it all, and faces the crowd.”

The attorney claimed someone with malicious intent robbed his client in order to tarnish the Slowbucks brand, an urban clothing label Slow co-founded.

“They know he is the founder of Slowbucks, the #1 urban brand on the rise today. They want to hurt that brand and they are trying to hurt that brand we are going to put an end to that,” he said. “We’re here, I’m a trademark attorney, I’m a copyright attorney and I fight unfair competition.”

Botsany also claimed 50 was lying when he told US radio host Angie Martinez earlier this week he had no knowledge of the alleged robbery.

“I looked at the videos and I heard 50's interview on [Hot] 97 by Angie, who did an excellent job questioning him and I heard his responses and his demeanour,” he said. “If you look at him he says, ‘Oh I was looking at the crowd.’ I didn’t know what was going on behind me. I was happy that day.’ But if you look at him when he’s telling that story, he doesn’t look happy. He doesn’t look like he wants to talk about it…”

A lawsuit has yet to be filed, however Botsany said he has no plans to back down. He said of his client: “He had the courage and the strength to come here and remind everyone that no matter how rich or powerful some might become, how popular they may be, they still are not above the law.”

50 had not commented on the claims publicly at press time.