Pakistan's public show of anger with the U.S. comes amid revelations that President Bush secretly approved new U.S. military raids in that country.

ISLAMABAD, Pakistan — Pakistan's prime minister today backed a harsh rebuke of the U.S. by the Muslim nation's military chief, a sign of a strain in relations seven years after the Sept. 11 attacks forged the two countries' anti-terror alliance.

Pakistan's public show of anger with the U.S. comes amid revelations that President Bush secretly approved new U.S. military raids in that country.

A former intelligence official told The Associated Press that President Bush signed the classified order over the summer. It gives new authority to U.S. special operations forces to target suspected terrorists in the dangerous area along the Afghanistan border.

U.S. counterterror operations along the border are highly unpopular in Pakistan, whose new leadership is trying hard to show independence from Washington. The official spoke on condition of anonymity to describe the classified order.

Gen. Ashfaq Parvez Kayani, the powerful but media-shy army leader, said nearly a week after a deadly American-led ground assault in Pakistani territory that Pakistan would defend its sovereignty and that there was no deal to allow foreign forces to operate inside its borders.

He said unilateral actions risked undermining joint efforts to battle Islamic extremism.

"Reckless actions" which kill civilians "only help the militants and further fuel the militancy in the area," he said.

"The sovereignty and territorial integrity of the country will be defended at all cost and no external force is allowed to conduct operations inside Pakistan," he said in the Wednesday statement.

Prime Minister Yousaf Raza Gilani, in comments reported today by state media and confirmed by his office, said Kayani's words reflected government opinion and policy.

U.S. officials say clearing militants from such pockets in Pakistan's semiautonomous tribal regions is critical to reducing attacks on NATO and American forces in Afghanistan.

"Until we work more closely with the Pakistani government to eliminate the safe havens from which they operate, the enemy will only keep coming," said Adm. Mike Mullen, chairman of the Joint Chiefs of Staff. told the House Armed Services Committee on Wednesday.

A Pentagon spokesman would not directly respond to Kayani's remarks, but said the two countries were cooperating.

Still, the Pakistani leaders' comments indicate growing frustration and fading trust in both countries on the anniversary of the attacks in the United States.

Many Pakistanis blame their nation's alliance with the U.S. for fueling violence in their country, while U.S. officials worry that Pakistan's government is secretly aiding militant networks — keeping them as a wedge against longtime rival India.

The former U.S. intelligence official said the Pakistani government is not told about the targets of U.S. attacks in advance because of concerns that the Pakistani intelligence service and military are infiltrated by al-Qaida and Taliban supporters.

The "rules of engagement" have been loosened, allowing troops to conduct border attacks without being fired on first if they witness attacks coming from the region, the official said. That would include artillery, rockets and mortar fire from the Pakistan side of the border.

While Pakistan's government earlier issued strident protests over last week's ground assault, even summoning the U.S. ambassador, Kayani's statement was significant because he so rarely speaks publicly and because he heads Pakistan's most powerful institution.

In his first public criticism of American policy, Kayani indicated he was sensitive to anger among Pakistanis, and possibly even within the military, over the assault and suspected missile strikes, analysts said today.

"It expresses a deep concern in Pakistan and was quite timely because of the feeling in Pakistan as if the army and the government of Pakistan has surrendered to whatever Americans want to do in the tribal regions," political analyst Rasul Bakhsh Rais said.

Asked to comment on Bush's green-lighting of new U.S. military raids, which was first reported in the New York Times, the Foreign Ministry referred to Kayani's statement.

U.S. officials have acknowledged that American troops carried out the operation in South Waziristan but have not given details. The mission's goal and results remain unclear. Local residents said at least 15 people died.

The cross-border strike comes at politically sensitive times in both countries.

The Bush administration is on its way out, leading some analysts to speculate it is turning to missiles and ground assaults in Pakistan to try to score last-minute victories in the face of a growing Taliban insurgency in Afghanistan.

In Britain, Prime Minister Gordon Brown said he and Bush would hold a videoconference today to discuss a new approach to policing the Afghan-Pakistan border.

"What's happening on the border of Pakistan and Afghanistan is something where we need to develop a new strategy," Brown said. He offered no specifics.

Pakistan, meanwhile, just elected a new president, Asif Ali Zardari, the widower of slain ex-Prime Minister Benazir Bhutto, who is generally considered pro-American and has said terrorism is Pakistan's chief challenge.

Zardari was sworn in Tuesday and visited his wife's grave to pay respects today. He has faced some criticism for not being more outspoken in condemning U.S. strikes in Pakistan.

Also today, residents found the bodies of two men believed to be among 25 police recruits reported abducted by militants in northwest Pakistan. The partially beheaded bodies were found in an open area in Orakzai town, said Khan Afzal, the mayor of nearby Hangu district.

Meanwhile, the bullet-riddled bodies of three men active in anti-Taliban activities were found today in the Bajur tribal region, witnesses and officials said.

Government official Jawed Khan said the bodies were found with a letter saying, "This is the result of working against the Taliban and cooperating with the army instead of joining jihad."

Tribal leaders in the Salarzai area of Bajur have denounced the Taliban. Recently, armed tribal members torched and destroyed several suspected militant houses and hideouts.

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Associated Press writers Munir Ahmad and Zarar Khan in Islamabad, Riaz Khan in Peshawar, Habid Khan in Khar and Pamela Hess in Washington contributed to this report.