WASHINGTON (AP) – Osama bin Laden may be slipping back and forth from Pakistan to Afghanistan. Or the U.S. might not have a clue, more than eight years after the al-Qaida leader masterminded the terrorist attacks on America.

Given a chance Sunday to clear away some of the mystery surrounding the whereabouts of the world’s most wanted terrorist, Obama administration officials seemed to add to it with what appeared to be conflicting assessments.

The failed hunt for bin Laden has been one of the signature frustrations of the global war on terrorism that former President George W. Bush launched after the Sept. 11 attacks. The main explanation given by both the Bush and Obama administrations for not getting bin Laden is that they simply don’t know where he is.