PESHAWAR, Pakistan - Militants in northwest Pakistan disavowed a peace pact with the government and launched two days of suicide attacks and bombings that killed at least 73 people, dramatically escalating the violence in the al-Qaida infiltrated region.

Pakistani volunteers remove a dead body from the site of suicide bombing in Swat, a mountainous area of Pakistans North West Frontier Province bordering Afghanistan, Sunday, July 15, 2007. [AP]

The attacks Sunday and Saturday followed strident calls by extremists to avenge the government's bloody storming of Islamabad's Red Mosque and a declaration of jihad, or holy war, by at least one pro-Taliban cleric.

Termination of the peace treaty, the hopeful handiwork of President Gen. Pervez Musharraf, puts even greater pressure on the military leader as he struggles with both Islamic extremists and a gathering pro-democracy movement.

There is concern in Pakistan that the gathering sense of crisis could prompt Musharraf to cancel elections later this year and declare a state of emergency - despite his repeated denials.

However, Musharraf can also use the turbulence to convince Washington, his key backer, that he remains a vital bulwark against extremists in the Islamic world's only declared nuclear state.

The US national security adviser, Stephen Hadley, expressed concern Sunday about the threat from militants in Pakistan, but supported Musharraf's recent responses.

"He has a safe haven problem in an area of his country where Pakistan's central government has really not been present for decades or even generations. It is a problem for him," Hadley told CNN's "Late Edition."

But in a separate interview on Fox News Sunday, Hadley acknowledged that the United States was dissatisfied with Musharraf's policies.

"The action has at this point not been adequate, not effective," Hadley said. "He's doing more. We are urging him to do more, and we're providing our full support to what he's contemplating."

Abdullah Farhad, a militant spokesman, said the 10-month-old cease-fire was being terminated in North Waziristan, a remote area on the Afghan border where the US worries that al-Qaida has regrouped.

He said Taliban leaders made the decision after the government failed to abide by their demand to withdraw troops from checkpoints by Sunday afternoon. He also accused authorities of launching attacks and failing to compensate those harmed.

"The peace agreement has ended," Farhad told reporters in Peshawar, the capital of North West Frontier Province.

The government deployed thousands of troops to restive areas of the province in recent days in hopes of stemming a backlash to the storming of the radical Red Mosque.

But they failed to protect themselves Sunday against suicide attacks and a roadside bomb which together killed 44 people and wounded more than 100.

Two suicide bombers and a roadside bomb struck a military convoy in Swat, a mountainous area northeast of Peshawar, killing 18 people and wounding 47, a government official said, citing an official report being sent to Islamabad.

The official, who spoke on condition of anonymity because he was not authorized to speak with the media, said two explosive-laden vans driven rammed the convoy near the town of Matta. He said seven civilians also died.

Bodies and the wounded were pulled from the shattered military vehicles. Helmets, an engine, and pieces of twisted metal were strewn over a wide area, some of it stained with blood.

Television footage showed about half a dozen roadside houses also destroyed by the blasts. People dug four corpses out of the rubble, among them a young girl.

In the day's second attack, a suicide bomber targeted scores of people taking medical and written exams for recruitment to the police force in the city of Dera Ismail Khan. The blast killed 26 people and wounded 35, said police officer Habibur Rahman.

More than 150 people were on the grounds of the police headquarters when the bomber struck. Police said the bomber's head and suicide vest were found.

On Saturday, at least 26 soldiers were killed and 54 wounded in a suicide car bombing north of Miran Shah, North Waziristan's main town, the army said.

Interior Minister Aftab Sherpao said the government was investigating whether the attacks were related to the Red Mosque operation.

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