Marc Grossman, U.S. special representative to Afghanistan and Pakistan, and CIA Deputy Director Michael Morell gave overhead surveillance video and other information on the guerrilla locations in mid-May to Pakistani army chief Gen. Ashfaq Kayani and Lt. Gen. Ahmed Shuja Pasha, head of the Inter-Services Intelligence spy agency, officials told The Washington Post.
The information was shared in a "trust-building" campaign after the Osama bin Laden killing, but when Pakistani troops raided the sites in North and South Waziristan June 4, they found them abandoned.
U.S. officials suspect the ISI of tipping off the extremists but did not accuse it directly.
A top Pakistani officer said Friday the Americans also had identified other sites, including weapons depots, that were found empty.
"There is a suspicion that perhaps there was a tipoff," he told the Post. "It's being looked into by our people, and certainly anybody involved will be taken to task."
Pakistan has always denied its security forces are in league with insurgents.
CIA Director Leon Panetta arrived in Pakistan for talks Friday. A U.S. official said his message will be: "We are willing to share, but you have to prove you will act. Some of your people are no longer fully under your control."
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