US officials say Pakistan has apparently tipped off militants at two more bomb-building factories in its tribal areas.
The officials say that allowed the militants to flee after U.S. intelligence shared the locations with the Pakistani government.
One U.S. official said this was intended to give Pakistan another chance to build trust after the U.S. raid on May 2 that killed Osama bin Laden in Abbottabad.
The latest incident brings to a total of four bomb-making sites the U.S. has shared with Pakistan, only to have the terrorist suspects flee before the Pakistani military arrived much later.
Pakistani officials said this week they successfully raided two more sites, but offered no details.
All officials spoke on condition of anonymity to discuss matters
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