Lifestyle Reporter.

@GettyImages.

Music mogul Sean 'Diddy' Combs is being investigated by the New York City Police Department as he faces a lawsuit from his ex-girlfriend Cassie over alleged abuse, according to a report.

The rapper, 54, is the subject of what appears to be a sexual assault case, according to TMZ, although it is not clear who made the criminal complaint or any details. 

The revelation emerged on the same day that Diddy's former girlfriend Cassie filed a lawsuit in Manhattan's Federal District Court in which she accused him of rape and repeated physical abuse.

She said the music executive allegedly controlled and abused her for over a decade - as well as plying her with drugs, beating her, and forcing her to have sex with multiple male prostitutes while he watched and recorded.

The pair met in 2005 when she was aged 19 and split in 2018. Diddy has vehemently denied all of the 'offensive and outrageous allegations.'

Law enforcement sources told TMZ that there is an active case with the name 'Sean Combs' - but offered few other details including a possible victim. 

But it has been 'locked,' which means it contains sensitive information and that access is restricted, though a statement appears to suggest its connected to a sexual assault. 

A New York City Police Department statement read: 'The NYPD takes sexual assault and rape cases extremely seriously, and urges anyone who has been a victim to file a police report so we can perform a comprehensive investigation, and offer support and services to survivors.'

Cassie, 37, filed a federal lawsuit on Thursday against her ex-boyfriend Diddy. 

Among the serious allegations is that he sex trafficked her to male prostitutes to fulfill his voyeurism fantasies in hotels and at his home.

The lawsuit claims she was directed to have sex with multiple men - sometimes in masks and costumes - while the music exec watched, masturbated, and filmed.

Cassie, in the documents, called the ordeals 'horrific encounters' and said she had to take drugs to disassociate during the arrangements.

He called the alleged sexual exploitation 'freak outs,' according to the lawsuit, and they are said to have taken place in various hotel suites including at the Trump International Hotel in New York City.