Gates: No proof Pakistan officials knew about Osama

Defense Secretary Robert Gates says he believes "somebody" in Pakistan knew Osama bin Laden was hiding there, but there is still no evidence that top leadership in the country was aware.

And Joint Chiefs chairman Adm. Mike Mullen says it may take a while to find out if bin Laden had Pakistani protectors, as U.S. intelligence agencies analyze notebooks, computer data and other material seized when bin Laden was killed this month in a U.S. raid.

Gates and Mullen spoke at a Pentagon press conference Wednesday amid growing anger in Congress. Many lawmakers want to cut aid to Pakistan unless it takes strong action against militants using the country as a safe haven.