Pakistan Strife Raises U.S. Doubts on Nuclear Arms

By DAVID E. SANGER
NYT

WASHINGTON — As the insurgency of the Taliban and Al Qaeda spreads in Pakistan, senior American officials say they are increasingly concerned about new vulnerabilities for Pakistan’s nuclear arsenal, including the potential for militants to snatch a weapon in transport or to insert sympathizers into laboratories or fuel-production facilities.

The officials emphasized that there was no reason to believe that the arsenal, most of which is south of the capital, Islamabad, faced an imminent threat. President Obama said last week that he remained confident that keeping the country’s nuclear infrastructure secure was the top priority of Pakistan’s armed forces.

But the United States does not know where all of Pakistan’s nuclear sites are located, and its concerns have intensified in the last two weeks since the Taliban entered Buner, a district 60 miles from the capital. The spread of the insurgency has left American officials less willing to accept blanket assurances from Pakistan that the weapons are safe.

Pakistani officials have continued to deflect American requests for more details about the location and security of the country’s nuclear sites, the officials said.

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