Pakistan's government has attached high hopes to the success of the peace talks in Miranshah, the main town of the troubled North Waziristan tribal region.

Meanwhile, the Supreme Court was set to rule Friday on an appeal by Pakistan's top judge against his suspension by President Gen. Pervez Musharraf that has triggered political turmoil.

Iftikhar Mohammed Chaudhry's suspension in March sparked protests by lawyers and opposition parties that have grown into a powerful pro-democracy movement just as Musharraf faces a rising tide of Islamic militancy.

It has been described as the biggest challenge to Musharraf since he seized power in a bloodless 1999 coup. A defeat for Musharraf would further undermine his standing, which has been crumbling both among voters and his political allies.

Suicide attacks, shootings and a siege and army raid on a mosque in Islamabad have killed about 288 people in Pakistan so far this month, raising concern about the threat posed by Islamic extremists and the country's political stability.

In the latest attack, a suspected militant struck his explosive-laden car with a small checkpoint on the outskirts of Miranshah on Friday, killing one soldier and three passers-by, according to two local security officials.

The officials, who spoke on condition of anonymity because of the sensitive nature of their job, said the attacker detonated the car bomb when asked to halt.

The attack comes a day after three suicide bombings in northwestern Pakistan and the south killed at least 51 people.

Violence has spread from Pakistan's tribal areas to the capital and elsewhere since last week when militants abandoned a 2006 peace deal they signed with the government to stop attacks on troops and officials.

The militants ended the agreement after the army's bloody assault on Islamabad's Red Mosque last week.

On Friday, tribal elder Malik Nasrullah told The Associated Press before entering talks with militant leaders he was "optimistic" the peace deal with the government could be revived.

"We will meet with them to request that they reverse their decision to end the peace agreement," said Nasrullah.

The meeting came a day after a suicide bomber driving a car hit a convoy carrying Chinese workers, killing 29 Pakistani bystanders and police, and prompting Musharraf to call for national unity against extremists.

Thursday's attack targeting a minibus carrying about 10 Chinese technicians occurred as their convoy was passing through the main bazaar in Hub, a town in Baluchistan province near the southern port city of Karachi.

Later Thursday, a suicide attacker detonated a bomb at a mosque in an army cantonment in the northwestern town of Kohat, killing at least 15 people, officials said.