"The victims deserve justice, and we will ensure they get it".
"Additional actions may be taken as the circumstances warrant", the department's statement says.
The Democratic and Republican leaders of the House Judiciary Committee on Monday addressed a letter to acting Bureau of Prisons director Hugh Hurwitz demanding answers to questions about Epstein's time in federal detention and asserting that Epstein's death "demonstrates severe miscarriages of or deficiencies in inmate protocol and has allowed the deceased to ultimately evade facing justice".
"We will get to the bottom of what happened at the MCC and we will hold people accountable for this failure", the attorney-general said.
This is not the first time the Manhattan Correctional Centre has come under scrutiny.
Both guards working on his unit were working overtime shifts, but it's unclear whether they were doing so voluntarily. But investigators learned those checks weren't done for several hours before he was found Saturday morning, according to a person familiar with the case.
Epstein appears in court in West Palm Beach, Fla., in July 2008.
Guiffer, who said she was used as a "sex slave" for Epstein from 1999 to 2002, alleged that Maxwell was a "primary co-conspirator" in the scheme. That person was not authorized to discuss the matter publicly and also spoke on condition of anonymity.
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While the exact manner of Epstein's death has not been officially announced, a second person familiar with operations at the jail said the financier was discovered in his cell with a bedsheet around his neck.
The 66-year-old financier had been on suicide watch, but apparently the watch was lifted. She noted the limitations jailers face when someone decides to take his or her own life. "They are going insane over a retweet because they have nothing else to complain about since the Russia HOAX is over!"
In recent weeks, the correctional officers' union has complained of understaffing.
Corrections officers attempted to revive him while saying "breathe, Epstein, breathe". The two guards were not identified. Another prison guard arrested along with Perez was convicted of raping a female inmate, while a third pleaded guilty to sexual abuse.
The U.S. Bureau of Prisons has said the FBI was investigating the circumstances.
"I think [prosecutors] are going to probably be moving as quickly as they possibly can", Levin says.
US District Judge Richard Berman, who was presiding over the case, denied Epstein's bail request last month.
The 12-storey jail had been created to house 449 inmates when it opened in 1975 near the Brooklyn Bridge.
Their attorney argued that clauses protecting four associates from prosecution are now invalid after Epstein's death by apparent suicide. "They no longer have anyone against whom to co-operate".
"The overall quality of staffing tends to be better than your average county jail in Bumbleberg", he said.