FBI agents searched the congressional office of Rep. William Jefferson of Louisiana Saturday evening in connection with a public corruption investigation that has already netted two guilty pleas by two associates, authorities said.
The search began at 7:15 p.m. EDT in the Rayburn House Office Building, where Jefferson's office is located, said Debra Weierman, an FBI spokeswoman.
It was not clear what agents were looking for and Weierman said she could provide no additional details because the affidavit supporting the search warrant was sealed.
But she indicated the search could take several hours.
FBI agents searched Jefferson's homes in Washington and New Orleans last August, hauling away boxes and bags from one of the residences.
Jefferson, a Democrat in his eighth congressional term, declared his innocence Monday during news conference outside the federal building in New Orleans and said he will not resign in the face of the investigation that has resulted in guilty pleas from two people who implicated him in a bribery scheme.
"I would take full responsibility for any crime that I committed, if that were the case. But I will not plead guilty to something I did not do, no matter how things are made to look and no matter the risk," Jefferson said the news conference.
He took no questions and said he was there "to declare, among other things, my continued intention to serve."
Jefferson said if indicted he was "prepared to answer these charges formally when and if the time comes."
Jefferson said he was addressing the situation because he believed his constituents deserved to hear some response to recent publicity about the case.
He said the guilty pleas in federal court in Virginia came from friends who succumbed to enormous pressure from the federal government.
"In order to protect themselves, they have now characterized their relationship with me, or with my family, in ways that fit neatly within the government's mistaken legal theories," he said.
In January, former Jefferson aide Brett Pfeffer pleaded guilty to bribery-related charges, saying Jefferson demanded money in exchange for help in brokering two African telecommunications deals.
Vernon Jackson, chief executive of iGate Inc., a Louisville, Ky., telecommunications firm, subsequently pleaded guilty to bribery, admitting he paid hundreds of thousands of dollars to Jefferson and his family members in exchange for the congressman's help obtaining business deals in Nigeria, Ghana and Cameroon.
The House Ethics Committee has opened an inquiry into the case.