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WASHINGTON (AP) -- The Associated Press has learned the CIA thwarted a plot by al-Qaida's affiliate in Yemen to destroy a U.S.-bound airliner using a bomb with a new design around the one-year anniversary of the killing of Osama bin Laden.

U.S. officials say the plot involved an upgrade of the underwear bomb that failed to detonate aboard a jetliner over Detroit on Christmas 2009. This new bomb was also built to be used in a passenger's underwear but contained a more refined detonation system.

The would-be suicide bomber was told to buy a ticket on the airliner of his choosing and decide the timing of the attack. It's not immediately clear what happened to the would-be bomber.

The U.S. officials spoke on the condition of anonymity to discuss the sensitive case.