The 66-year-old financier was found dead in his cell at the Metropolitan Correctional Center in New York on August 10.

Jeffrey Epstein’s prison death has been ruled a suicide by hanging, the medical examiner’s office has said after an autopsy, according to reports in the United States.

The 66-year-old was found dead in his cell at the Metropolitan Correctional Center in New York City on August 10, touching off outrage and disbelief over how such a high-profile prisoner, known for socialising with powerful people including presidents Donald Trump and Bill Clinton, could have gone unwatched.

The Bureau of Prisons said Epstein had apparently killed himself, but that did not quash conspiracy theories about his death.

Aja Worthy-Davis, spokeswoman for the New York City Office of Chief Medical Examiner, said an official report on Epstein’s death would be disclosed on Friday.

“We are sending the determination out very shortly. It is suicide by hanging,” Worthy-Davis told Reuters News Agency.

Epstein, who was charged with sexually abusing numerous underage girls over several years, had been placed on suicide watch last month after he was found on his cell floor on July 23 with bruising on his neck.

But multiple people familiar with operations at the jail say he was taken off the watch after about a week and put back in a high-security housing unit where he was less closely monitored, but still supposed to be checked on every 30 minutes.

Attorney General William Barr says officials have uncovered “serious irregularities” at the jail. The FBI and the Justice Department’s inspector general are both investigating Epstein’s death.

Jail guards on duty the night of Epstein’s death are suspected of falsifying log entries to show they were checking on inmates every half-hour as required, according to several people familiar with the matter.

A guard in Epstein’s unit was working a fifth straight day of overtime and another guard was working mandatory overtime, the people told The Associated Press news agency. They spoke on condition of anonymity because the lacked authorisation to publicly discuss the investigation.

US District Judge Richard Berman, who is in charge of the criminal case against Epstein, asked the jail’s warden this week for answers about the earlier episode, writing in a letter on Monday that it had “never been definitively explained.”

The warden replied that an internal investigation was completed but that he could not provide information because the findings were being incorporated into investigations into Epstein’s death.

The medical examiner’s ruling came a day after two more women sued Jeffrey Epstein’s estate, saying he sexually abused them.

The suit, filed on Thursday in a federal court in New York, claims the women were working as hostesses at a popular Manhattan restaurant in 2004 when they were recruited to give Epstein massages.

One was 18 at the time. The other was 20.

One plaintiff now lives in Japan, the other in Baltimore. They seek $100m in damages, citing depression, anxiety, anger and flashbacks.

Other lawsuits, filed over many years by other women, accused him of hiring girls as young as 14 or 15 to give him massages, then subjecting them to sex acts.