Mohammad Yunus Qanuni, who is also a leading opposition figure, said the government had ignored parliament's demand for the suspension of officials in the northern province of Baghlan, where a suicide bomber attacked a visiting delegation of lawmakers on Nov. 6.

Some 77 people were killed and over 100 were wounded in the blast and the subsequent shooting by panicking guards, officials said.

Shortly after the incident, the parliament demanded the suspension of Baghlan's governor and six other provincial officials pending the results of a government investigation.

"I do not want to stay here and sit in this position until your demands are fulfilled," Qanuni said shortly before leaving the chamber Nov. 26.

Dozens of lawmakers followed Qanuni out of the chamber.

There was no immediate comment from President Hamid Karzai's government, which is yet to announce the results of its own investigation into the incident.

Qanuni is a leading figure in the National Front, the largest opposition group challenging Karzai's authority and the walk out is likely to deepen the political divide in this war-torn country.

Parliament has no power to appoint or remove provincial governors.

An internal U.N. report obtained by The Associated Press last week, suggested that lawmakers' bodyguards fired wildly into a crowd after the suicide bombing, killing mostly schoolchildren.

The bodyguards were accompanying a dozen lawmakers from parliament's economic committee being greeted by hundreds of children on a visit to a sugar factory in the normally peaceful north.

A remotely controlled bomb struck an Afghan army vehicle in the eastern Paktia province on Monday, killing four soldiers and seriously wounding two others, said Din Mohammad Darwish, spokesman for the provincial governor.

Separately, a blast ripped through a car and killed four male civilians south of the capital Kabul, police said. The attack took place in the Musayi district of Kabul province, said regional police commander Gen. Zalmai Oryakhail. It was not clear why the men were targeted, he said.

More than 6,000 people - a record number - have died this year in insurgency related violence in Afghanistan, according to figures from Afghan and Western officials. Most of those reported killed have been militants.

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