The raid comes as part of the FBI's probe into former financier Jeffrey Epstein's apparent suicide at in a New York City prison where he had been held ahead of his pending trial; he was charged with the sex trafficking of minors.
The person wasn't authorized to disclose information about the investigation and spoke on condition of anonymity.
Two other staff members who were assigned to Epsteins' unit at the Metropolitan Correctional Center (MCC) have also been placed on leave.
The warden at the federal jail where Jeffrey Epstein took his own life over the weekend was removed Tuesday and two guards who were supposed to be watching the financier were placed on leave while federal authorities investigate the death.
Two prison guards have been suspended and a warden temporarily reassigned at the New York City jail where Jeffrey Epstein died of suspected suicide.
The FBI and the Department of Justice's Inspector General opened investigations into his suicide while he was in federal custody.
Kupec said James Petrucci, the warden at Federal Correctional Institution Otisville in NY, was named as acting MCC warden.
"Additional actions may be taken as the circumstances warrant", the department's statement says. McCawley urged authorities to continue their investigation, focusing on Epstein associates who she said "participated and facilitated Epstein's horrifying sex trafficking scheme".
A second person familiar with operations at the jail said Epstein was discovered in his cell with a bedsheet around his neck.
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Documents unsealed in Manhattan federal court last week revealed how Epstein arranged for young girls to perform nude "massages" and other sex acts.
The 66-year-old was found dead in his cell at the Manhattan Correctional Centre on Saturday morning, sources said, and the medical examiner's office confirmed his death. In addition, guards are required to make another check every 15 minutes on prisoners who are on suicide watch.
Maxwell's publicist and lawyers didn't immediately respond to emails seeking comment.
Mr Barr, the top United States law enforcement official, vowed to carry on the case against anyone complicit with Mr Epstein.
According to police reports, Federal Bureau of Investigation records and court documents, Epstein had a team of recruiters and other assistants who knew of his penchant for girls and lined up victims for him.
In his letter, Sasse quoted a report that said the deal 'essentially shut down an Federal Bureau of Investigation probe into whether there were more victims and other powerful people who took part in Epstein's sex crimes'.
"But, when they checked the plane logs, Bill Clinton - who is a very good friend of Epstein - he was on the plane about 27 or 28 times, so, why did he say four times?" questioned the president.
Sen. Ben Sasse, Nebraska Republican and a longtime critic of Epstein, demanded Tuesday that Mr. Barr publicly repudiate a non-prosecution deal the Justice Department struck a decade ago with Epstein, which protected some of those co-conspirators from legal punishment.
A prison and law enforcement official told The New York Times late Tuesday that the guards failed to check on Epstein for about three hours before his death - though it's unclear how much of that time was spent snoozing.