Alaska ? Federal agents searched the home of U.S. Sen. Ted Stevens on Monday, focusing on records related to his relationship with an oil field services contractor jailed in a public corruption investigation, a law enforcement official said.

Stevens, 83, has been under a federal investigation for a 2000 renovation project more than doubling the size of his home in Girdwood that was overseen by Bill Allen, a contractor who has pleaded guilty to bribing Alaska state legislators.

Allen is founder of VECO Corp., an Alaska-based oil field services and engineering company that has reaped tens of millions of dollars in federal contracts.

Agents from the FBI and Internal Revenue Service started their search at the senator’s home Monday afternoon, said Dave Heller, FBI assistant special agent. He said he could not comment on the nature of the investigation.