Up to 20 officers at a Manhattan detention facility where disgraced financier Jeffrey Epstein was being held before his death earlier this month have reportedly been subpoenaed by a federal grand jury for testimony.

CNN reported Thursday that a source close to the investigation said that as many as 20 subpoenas have been issued, with more possibly on the way.

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Epstein, 66, was found dead due to an apparent suicide after guards reportedly failed to conduct rounds by his cell over the course of three hours, despite regulations stating that he was to be checked on every 30 minutes.

The financier was awaiting trial on charges of trafficking underage girls for sex and had previously been found unconscious in his cell with injuries around his neck and placed on suicide watch. He was later removed from suicide watch before his death.

Attorney General William Barr Bill BarrFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Why a backdoor to encrypted data is detrimental to cybersecurity and data integrity FBI official who worked with Mueller raised doubts about Russia investigation MORE announced earlier this month that the FBI and Justice Department's Office of Inspector General would conduct investigations into the circumstances surrounding Epstein's death.

Barr said he was "appalled" by Epstein's death and spoke of "serious irregularities" at the Metropolitan Correctional Center in lower Manhattan where Epstein was being held before he died.

The attorney general later ordered the warden at the federal prison to be temporarily reassigned pending the federal investigations and this week also dismissed Hugh Hurwitz, acting director of the Bureau of Prisons.