Saturday's attack came days after Pakistani leaders told Richard Holbrooke, an American envoy dispatched by President Barack Obama to the region, that the U.S. attacks should be stopped as they were counterproductive and fueling anti-America sentiment in this Islamic nation.

It also came a day after a militant group holding an American employee of the United Nations warned it would kill him within 72 hours and issued a grainy video of the blindfolded captive saying he was "sick and in trouble."

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