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“We take very seriously the fact that while al Qaeda is weakened, it is not dead and it is obviously entirely possible, even likely, that terrorists whether organized or lone wolves, might try to respond with revenge attacks of some kind,” White House press secretary Jay Carney said.

Pakistani officials have tread cautiously since the bin Laden raid amid public fury and disbelief. They have said that bin Laden’s death was justice, but that they were not informed in advance of a raid they describe as a violation of Pakistan’s sovereignty.

In a closed-door session with Parliament on Friday, Pakistan’s intelligence chief, Gen. Ahmed Shuja Pasha, admitted “negligence” on the part of authorities in failing to find bin Laden, but also said his staff had long cooperated with the U.S. to try to destroy al Qaeda by killing or catching many of bin Laden’s allies, according to Information Minister Firdous Ashiq Awan.

Bin Laden was like a “dead person despite being alive,” Awan quoted the intelligence chief as saying.

Pasha rarely talks to media on the record. Lawmakers said after the session that he’d indicated he’d be willing to resign over the matter, but that no one demanded he do so.

According to Awan, an air force official said the military learned that “American planes were loaded with bombs” were in the air in Afghanistan, ready to retaliate in case Pakistani planes tried to intercept the U.S. helicopters. The U.S. has said it sent extra helicopters into Pakistani airspace to provide backup in case the Navy SEALs had to fight their way out of the country.

Those at the briefing included Pakistan’s powerful army chief, Gen. Ashfaq Parvez Kayani. The military leaders assured lawmakers that Pakistan’s nuclear arsenals are safe and promised to improve the country’s air defenses, Awan said.

Despite their displeasure with Pakistan, which many American officials believe maintains links to Afghan militants, the U.S. is likely to do its best to salvage the relationship simply because it needs Islamabad’s cooperation to bring an end to the war in Afghanistan.

The U.S. and NATO, for instance, rely heavily on Pakistani land routes to supply their troops.

On Friday, some two dozen vehicles, including 15 tankers carrying fuel for NATO in Afghanistan, were destroyed when a blast ripped through a parking lot in Pakistan’s Khyber tribal region, government official Tahir Khan said.

Also Friday, Pakistani intelligence officials said a U.S. missile strike killed three people near the Afghan border. The four missiles struck a vehicle in the Doga Madakhel village of North Waziristan tribal region. North Waziristan is home to many militants dedicated to attacking Western troops in Afghanistan.

The two officials spoke on condition of anonymity because they were not authorized to speak to media. They did not know the identities of the dead.

Toosi reported from Islamabad. Associated Press writers Ashraf Khan, Munir Ahmed, and Deb Riechmann in Islamabad, Babar Dogar in Lahore and Ishtiaq Mahsud in Dera Ismail Khan contributed to this report.