FBI officers raided a House of Representatives office building on Saturday night, and NBC television said it had searched the offices of Louisiana Democratic Rep. William Jefferson.
The Federal Bureau of Investigation confirmed the unusual raid at the Rayburn House Office Building on Washington's Capitol Hill but would not say whose office was searched.
Jefferson has maintained his innocence, but a former staffer and a Kentucky businessman have pleaded guilty to bribing him in connection with an African telecommunications venture.
According to court records filed in the plea deal, Jefferson helped secure a deal with a Nigerian company called Netlink Digital Television and in return demanded payments to a company maintained in the name of his wife and children.
