The Tehrik Taliban-e-Pakistan, which was formed in December with Mehsud as its commander, has given the government two days to end military operations at Swat in the North West Frontier Province and pull out all security forces from the area.

It warned that it would "expand its actions from Waziristan to Kohistan and settled districts" if its demand is not met.

Maulvi Muhammad Omar, a spokesman for the group, told the Dawn newspaper by telephone on Wednesday that an earlier deadline for withdrawing troops had lapsed in December, but the militants had not resumed their activities because the nation was mourning the killing of Bhutto.

"Now we extend the deadline for two days and ask the government to withdraw troops and halt the operation in Swat. Otherwise, we will attack the government everywhere and it will be an all-out war," he warned.

The Taliban and Mehsud have denied involvement in the attack on Bhutto in Rawalpindi on December 27. The government blamed Mehsud for masterminding the suicide strike on Bhutto and other political leaders.

In his address to the nation on Wednesday, President Pervez Musharraf blamed a series of suicide bombings across the country on Mehsud and Maulana Fazlullah, a pro-Taliban cleric from Swat, and their militants.

Omar also said his group was responsible for kidnapping four military personnel in South Waziristan and said troops were building new bunkers in the area for a possible operation against Mehsud.

Sources told the Dawn that former parliamentarian Maulana Merajuddin had reached Laddah, which has witnessed fierce clashes in the past few days, to negotiate the release of the four military personnel. At least 25 militants were killed in clashes near Laddah on Tuesday.