Prince Andrew The Duke of York arrives at the Headquarters of CrossRail in Canary Wharf on March 7, 2011 in London, England.

Britain's embattled Prince Andrew has given "zero cooperation" to federal authorities with their ongoing investigation of people who enabled the crimes of the late sex offender Jeffrey Epstein, his former friend, a top prosecutor said Monday.

U.S. Attorney Geoffrey Berman said that Andrew, a son of Queen Elizabeth II, has not followed through on a public offer he made in November to help investigators with probes of the wealthy Epstein.

Berman spoke to reporters outside of Epstein's luxurious townhouse on Manhattan's Upper East Side, the site of many of his alleged misdeeds.

Berman previously has said that his office is investigating possible co-conspirators of Epstein, who killed himself in August in jail while awaiting trial on child sex trafficking charges.

"To date Prince Andrew has provided zero cooperation," Berman said.

"Jeffrey Epstein couldn't have done what he did without the assistance of others, and I can assure you that the investigation is moving forward," he said.