Sean “Diddy” Combs once bragged about torching an alleged victim’s convertible with a Molotov cocktail just weeks after a gunpoint kidnapping, Manhattan federal prosecutors said Tuesday — as they sought to detain the rapper on sex trafficking and racketeering charges pending a trial.

The embattled hip-hop mogul and one of his cronies had allegedly kidnapped a victim at gunpoint in December 2011 as they tried to break into the home of another individual, according to prosecutors.   

Two weeks later, Combs’ crew then set fire to the victim’s car by slicing open the convertible’s roof and dropping the Molotov cocktail inside, the court papers say.

Cops and fire officials reported, at the time, that the fire was intentionally set.

The fiery allegations were among those laid bare in a detention memo unsealed alongside the sex-trafficking indictment that accuses Combs of abusing women for more than a decade.

He faces a mandatory minimum 15-year prison sentence and up to life behind bars if convicted of the three felony counts of racketeering conspiracy, sex trafficking and transportation to engage in prostitution.

Prosecutors, who argue that the stiff potential sentence could give Combs incentive to flee, are asking the judge to keep him locked up. His lawyers, however, are pushing to have him released on a $50 million bond.

Elsewhere in the detention memo, prosecutors painted the 54-year-old — who was arrested in the Big Apple late Monday — as a violent, sex fiend who would drug, abuse, threaten and coerce his alleged victims.

“As set forth below, there is no condition, or combination of conditions, that will reasonably assure the appearance of the defendant as required and the safety of others and the community, not to mention the integrity of the proceedings,” prosecutors wrote in the filing.

They described how Combs allegedly drugged female victims with ketamine, ecstasy, and gamma-hydroxybutyrate (“GHB”) — and then forced them into his sick “Freak Off” sex sessions with male prostitutes.

As the alleged mastermind, Combs “arranged, directed, masturbated during, and often electronically recorded” the so-called Freak Off sessions, the memo says.

They were given the drugs so they could “continue to engage in Freak Offs, despite fatigue, physical and emotional exhaustion, and pain,” the filing added.

During one of the sick ordeals, Combs allegedly beat one female victim when she attempted to leave a hotel in March 2016 – and then tried buying off a security guard with a “stack of cash,” according to prosecutors.

Combs was captured on video “striking, kicking and dragging a woman” in the public area of a hotel before a hotel security staff member intervened.

The staff member turned down Combs’ bribe, but the rapper had already spoken to other employees at the hotel who were in contact with the victim to “cover up” his alleged assault and “prevent the incident from being publicly disclosed,” the memo charges.

In another instance, Combs allegedly paid more than $46,000 in 2012 to cover damages inflicted on a Manhattan hotel penthouse during one of the twisted Freak Off sessions in 2012, prosecutors said.

Combs has long denied the accusations against him.