U.S. financier Jeffrey Epstein appears in a photograph taken for the New York State Division of Criminal Justice Services' sex offender registry March 28, 2017 and obtained by Reuters July 10, 2019.

Accused sex trafficker Jeffrey Epstein is on a suicide watch after the wealthy financier was found mysteriously injured in his cell in a federal jail in New York City, WNBC-TV reported Wednesday night.

Epstein, who was arrested in early July on federal charges, was on the floor of his cell in a fetal position when he was discovered, sources told NBC. He was semi-conscious and had marks on his neck when he was found.

Epstein may have tried to hang himself in the lower Manhattan lockup, according to sources who spoke with WNBC-TV.

But another source said Epstein's injuries were not serious, and raised the possibility that he may have used the incident to try obtain a transfer from the jail.

A fourth source who spoke with NBC said that officials have not ruled out the chance that Epstein was assaulted in the Metropolitan Correctional Center, where he was being held in the jail's Special Housing Unit to protect him against possible violence from inmates in general population.

Another inmate in that jail, where Epstein is being held without bail, has been questioned about the incident.

NBC reported that the inmate was Nicholas Tartaglione, a former Orange County, New York, police officer who was arrested in December 2016 and accused of killing four men in an alleged cocaine distribution conspiracy.

Two sources told NBC on Thursday that Tartaglione was cellmates with Epstein.

A spokesman for the U.S. Bureau of Prison said on Thursday that Epstein remains in the MCC, despite some reports that he is in a local hospital.

"As with all inmates, for privacy and security reasons, we do not share information on an inmate's medical status or their conditions of confinement," the BOP spokesman said.