"It is difficult to achieve peace in Afghanistan as long as there is safe haven for terrorists in Pakistan," Panetta told reporters on the last stop of his nine-day swing through Asia. He made it clear that the drone strikes will continue.
The CIA has launched eight Predator drone attacks since Pakistan's president, Asif Ali Zardari, was invited to attend the May 20-21 NATO summit in Chicago but refused to make a deal to reopen crucial routes used to supply U.S. troops in Afghanistan, as the White House had hoped.
The CIA had logged 14 remotely piloted strikes on targets in Pakistan's rugged tribal belt in the previous 51/2 months, according to the New America Foundation, a U.S. think tank that tracks reported attacks.
"Obviously, something changed after Chicago," said a senior congressional aide in Washington, speaking on condition of anonymity in discussing a classified program. "I am only getting the official story, but even within the official story there is an acknowledgment that something has changed."
Another congressional official said the surge in drone attacks stemmed in part from success in tracking down militants on the CIA's target list, although only one has been publicly identified.
Pakistanis view the drone strikes as an attempt to intimidate their civilian and military leaders into giving in to U.S. demands. If that's the strategy, it won't work, said experts and analysts in Islamabad, the Pakistani capital.
"They are trying to send a message: 'If you don't come around, we will continue with our plan, the way we want to do it,'" said Javed Ashraf Qazi, a retired Pakistani intelligence chief and former senator. It's "superpower arrogance being shown to a smaller state. . . . But this will only increase the feeling among Pakistanis that the Americans are bent on having their way through force and not negotiation."
A White House official said no political or foreign policy considerations would have prevented the CIA from taking action when it found Abu Yahya al Libi, al-Qaeda's No. 2 leader, who was killed Monday by a drone-fired missile in Pakistan.
Each side blames the other for the current dispute.
Pakistan has blocked convoys hauling NATO war supplies from the port city of Karachi since a clash near the Afghan border in November led U.S. helicopters accidentally killing two dozen Pakistani soldiers.
As part of the fallout, Pakistan ordered the U.S. to leave an air base in the country's southwest that the CIA had used to launch drones bound for targets in the tribal areas. Since then, the aircraft reportedly have flown from across the border in Afghanistan.
The U.S. initially halted all drone strikes for two months to ease Pakistani sensitivities, and the attacks resumed only sporadically after mid-January. By May, Pakistani officials were signaling a willingness to reopen the supply route to resurrect relations.
But talks deadlocked over Pakistan's demands for sharply higher transit fees just before the NATO conference, and President Obama appeared to give Zardari a cold shoulder in Chicago. Pentagon officials will visit Islamabad this week for a new round of talks.
After the U.S.-led invasion of Afghanistan in late 2001, Pakistan allowed NATO supplies to be transported through its territory at no charge. It later levied a token $250 charge per truck. Islamabad now wants more than $5,000 per truck to reopen the road, a toll U.S. officials refuse to pay.
As an alternative to Pakistan, Washington concluded a deal this week to haul military gear out of landlocked Afghanistan through three Central Asian nations.