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Mr. Cooke declined to comment on the case.

Mr. Gray is in Las Vegas for an international shopping-center convention. His attorney, Robert S. Bennett, declined to comment on the mayor’s behalf, citing the pending investigation.

Ongoing probe

Investigations by the D.C. Council and a House oversight committee last year found numerous missteps and suspicious payments by Mr. Gray’s 2010 campaign, but the most serious issues fell short of the mayor.

A special committee by council member Mary M. Cheh, Ward 3 Democrat, mentions Mr. Gore once and links him to the activities of Howard Brooks, who Mr. Brown accused of providing him most of the payments.

Mr. Brooks has kept a low-profile during the federal probe and declined to testify in front of Ms. Cheh’s panel, citing his Fifth Amendment rights, although a WUSA-TV (Channel 9) report in October said Mr. Brooks was cooperating with authorities and wore a wire to record conversations for prosecutors. He has not been charged with any crimes.

Gerri Mason Hall, who served as Mr. Gray’s chief of staff before she was fired in March 2011 amid the swirling scandal, mentioned Mr. Gore when the panel asked her about Mr. Brooks’ role on the campaign.

“I’m not 100 percent sure of Mr. Brooks’ role,” she said, according to the council’s transcript. “It was my understanding that he worked closely with Tom Gore, who was the finance lead for the campaign. And I’m not sure about Mr. Gore’s exact title, but he overall managed the finances.”

Ronald C. Machen Jr., the U.S. attorney for the District, declined to comment on the case on Monday, his spokesman said.

Existing court documents and the office’s silence give little indication of where the federal probe is heading or how high it could climb on the power chain of D.C. politics.

The most recent ripple occurred in early March, when federal agents raided the home of prolific campaign donor Jeffrey E. Thompson as part of an apparent probe into campaign-finance matters. Mr. Thompson, who has given to nearly all of the District’s sitting politicians, has not been accused of any crimes or wrongdoing.

On Monday, Ms. Cheh said it is unfortunate that people now face criminal charges, but there should consequences for any misdeeds.

“I’m just happy that there’s movement now,” she said of the long-running probe. “Let’s get it done.”