*Fat Joe was detained by police in Madison, Wisconsin Sunday night after a 33-year-old woman accused the rapper and his entourage of sexually assaulting her inside a Cadillac limo. 

Citing the Madison police department, TMZ.com reports that the woman alleges the assault happened after the artist — real name Joseph Cartagena — performed at a concert at The Orpheum Theater last night.

According to police, the woman claims, “shortly after the concert had concluded … [she] found herself inside of a Cadillac limousine with Joseph Cartagena and other male subjects all with the destination of a hotel located on Madison’s west side.”

Cops tell TMZ Fat Joe was detained for questioning — but was not arrested. He was released this morning — sometime before 7 a.m.

So far, no arrests have been made and police say the investigation is ongoing.