Iraq’s prime minister said Tuesday that security forces have recaptured the strategic city of Tikrit after a monthlong battle.

However U.S. military officials said they were unable to confirm the assertion and expressed skepticism that the fight for the Sunni city was all but over. The U.S.-led coalition fighting Islamic State has been conducting airstrikes since last week to aid Iraqi forces trying to retake Tikrit.

If confirmed, the recapture of Tikrit would be the greatest victory yet against Islamic State insurgents since the Sunni extremist group seized swaths of the country last summer. […]