[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/07/29/art.stevens.gi.jpg caption="Stevens is facing a federal indictment."](CNN) - Sen. Ted Stevens is expected to be indicted this afternoon by a federal grand jury, CNN has learned. A government source and a source familiar with the investigation would not tell CNN what charges are expected to be filed against the Alaska Republican.
Stevens has been the subject of a wide-ranging federal investigation focusing on Alaska state lawmakers and an Energy company in the state.
Steven's Alaska home was searched last July.
Watch: Stevens' home gets raided
FBI and Internal Revenue Service agents searched Stevens' Alaska home in July 2007 in connection with the probe, which has already snared two oil-company executives and a state lobbyist. At the time, he urged constituents "not to form conclusions based upon incomplete and sometimes incorrect reports in the media."
The 84-year-old senator is a former chairman of the Senate Appropriations Committee and is renowned for his prowess in steering federal funds to his vast, sparsely populated state. He has represented Alaska in Washington since 1968 and is up for re-election in November.