The FBI is expanding a corruption probe involving officials in the District, including Mayor Vincent Gray.
Two years ago, when Gray decided to challenge Adrian Fenty for mayor, Gray rushed to quickly set up a campaign and fundraising effort.
Gray campaign officials said prominent businessman Jeff Thompson, who holds a $300 million medical contract with the city, played a key role in early fundraising for hundreds of thousands of dollars in Gray’s race for mayor.
On Friday, agents raided the home of Thompson -- one of the city's most prominent and politically active contractors. They also raided his offices on 15th Street downtown.
Gray's office was still declining comment Monday, as was a spokesman for Thompson. Reuben Charles -- a key fundraiser for Gray -- could not be reached for comment on the raid.
Council Chairman Kwame Brown, whose own 2008 campaign also is the focus of a federal investigation, said he knew little of the raid.
Friday's raid was the biggest move by federal prosecutors since January, when former Ward 5 Council member Harry Thomas Jr. pleaded guilty to two felonies for theft of government funds and resigned.