WASHINGTON (AP) — A Senate investigation concludes waterboarding and other harsh interrogation methods provided no key evidence in the hunt for Osama bin Laden, according to congressional aides and outside experts familiar with a still-secret, 6,200-page report. The finding could deepen the worst rift in years between lawmakers and the CIA.

The CIA disputes the conclusion and already is locked with the Senate intelligence committee in an acrimonious fight amid dueling charges of snooping and competing criminal referrals to the Justice Department. The public may soon get the chance to decide, with the congressional panel planning to vote Thursday to demand a summary of its review be declassified.