Here’s more from the outlet: A witness tells us the whole thing started when Trey was being heckled by some fans a few rows behind him and he asked them to chill out. We’re told the officer approached Trey, and without warning, went after him. The witness says Trey was totally caught off guard when the officer got physical, and started to defend himself. A law enforcement source tells us … Songz was arrested for trespassing, resisting arrest — both misdemeanors — and for assaulting a police officer … a low-grade felony. Witnesses told TMZ that Trey was being heckled and was acting in self-defense. He was arrested for “trespassing and resisting arrest — both misdemeanors — and for assaulting a police officer, a low-grade felony,” the outlet writes.