Pakistans paramilitary troops stand alert behind a makeshift bunker along the road side in Swat, a mountainous area of Pakistans North West Frontier Province bordering Afghanistan, Saturday, July 14, 2007. [AP]

ISLAMABAD - Suicide bombers killed almost 60 people in three weekend attacks in Pakistan, police said Sunday, after Islamic militants called for holy war over a deadly army raid on a pro-Taliban mosque.

At least 18 people were killed Sunday in a blast at a police recruitment centre in North West Frontier Province, hours after two explosives-packed cars plowed into an army convoy in the province's Swat Valley, claiming 17 lives.

The previous day, a suicide car bomber killed 24 people in a similar attack on a paramilitary convoy in North Waziristan tribal region, launching the string of attacks that has left at least 59 dead and scores more wounded.

The death toll from the carnage was expected to rise after the latest blast, which left limbs and blood scattered across the police recruitment centre, as at least a dozen people were in critical condition in the local hospital.

The bloodshed came amid outrage among hardliners in the mainly Muslim nation over the army's raid last week on Islamabad's Red Mosque, which has saddled President Pervez Musharraf with the worst crisis since he took power in 1999.

The raid which left 86 dead, most of them militants, led Al-Qaeda's number two to call for jihad against the government, which has sent thousands of troops into remote tribal areas to try to keep a lid on bubbling public anger.

"This is very unfortunate," said Interior Minister Aftab Sherpao.

While he said Saturday's attack in North Waziristan likely stemmed from an older dispute with tribal groups, he conceded that the other two attacks "to some extent ... could have some linkage with the Red Mosque."

Pro-Taliban militants in North Waziristan scrapped a controversial peace accord reached with the government last year, in which the tribal groups had promised to hunt down foreign fighters in return for security assurances.

The Taliban Shura (Taliban Council) said in pamphlets that it would refuse all dialogue and cooperation with authorities after the government had failed to meet a Sunday deadline to abandon 25 new military checkpoints.

"We had signed the agreement for the safety and protection of the lives and property of our people," the statement said. "But the government forces continued to launch attacks on the Taliban and have killed a number of people."

Sherpao, speaking on local television, countered: "We have been insisting that they are not enforcing the agreement strictly. Now the government will be justified if it takes some action."

Residents of Miranshah, the capital of North Waziristan, said about 100 local families had left, fearing clashes, and that the main bazaar was deserted, while families of many government employees had also fled.

Pakistani army trucks carrying thousands of additional troops have rumbled into remote areas in recent days after Musharraf vowed to crush extremists and "root them out from every corner of the country."

Militants last week had attacked police and security posts in the Swat Valley after local pro-Taliban cleric Maulvi Fazlullah in radio broadcasts urged followers to wage jihad over the mosque attack.

Sherpao said Sunday's attack on the police recruitment centre in Dera Ismail Khan came three days after police arrested three would-be suicide attackers in the town and seized an explosive-laden vehicle and several suicide jackets.

Besides the spate of violent attacks on government forces, there has been political fallout in the world's second-largest Muslim nation amid heightened tensions triggered by the week-long siege and final raid on the Red Mosque.

Qazi Hussain Ahmed -- the powerful head of the six-party Islamic alliance, the Muttahida Majlis-i-Amal -- said Saturday he would resign from parliament to protest the raid and the ongoing troop build-up.

The United States has raised pressure on ally Musharraf, the army chief who grabbed power in a coup eight years ago, to do more to hunt down Taliban and al-Qaeda insurgents hiding in Pakistan's rugged lands bordering Afghanistan.

New US intelligence reports suggest Al-Qaeda is gaining strength and has established a safe haven in remote tribal areas of western Pakistan for training and plotting new attacks, the Washington Post said last week.

White House national security advisor Stephen Hadley, speaking on US television, said Musharraf had failed to contain al-Qaeda and said his plan to give tribal leaders more autonomy "has not worked the way it should have."