The federal investigation of District Mayor Vincent C. Gray’s 2010 mayoral campaign is “continuing,” a federal prosecutor said Tuesday.

Assistant U.S. Attorney Ellen Chubin Epstein made the disclosure during a brief status conference for Thomas W. Gore, a former assistant treasurer for the Gray (D) campaign, in the District’s federal court.

Gore pleaded guilty in May to helping to secretly finance the campaign of minor candidate Sulaiman Brown to bolster his boss’s prospects and then destroying a ledger detailing the payoffs.

Epstein said Gore’s “obligations” under the plea deal are continuing. Gore’s attorney, Frederick D. Cooke Jr., told the judge that he hoped his client’s involvement in “that part of the process” will be brought “to closure, sooner rather than later.”

Because he is cooperating with federal prosecutors as part of his plea deal, no sentencing date has been set for Gore .

U.S. District Judge Colleen Kollar-Kotelly set another status conference for Dec. 12.