The United States has assured Pakistan not to carry out any drone strike during peace talks with the Taliban, Pakistan's top security advisor said on Wednesday.

Sartaj Aziz, who also deals with the foreign affairs, told the Senate Foreign Affairs committee in Islamabad that the US drone strike, which killed the Taliban chief Hakimullah Mehsud this month, has harmed the peace talks with the militants.

Mehsud was killed when American spy aircraft rained missiles into North Waziristan tribal region on November 1, just one day before a team of top Islamic scholars were to meet him to discuss the agenda and venue for the negotiations.

Tehrik-e-Taliban Pakistan (TTP) refused to talk to the government after the killing of their chief and also announced revenge attacks.

"The US drone which killed the Taliban leader harmed Pakistan 's peace initiative," Aziz told the committee convened to discuss the status of the government's peace efforts.

"The United States has now assured Pakistan that it will not launch any drone strike when talks with the Taliban are started," Aziz said.

Ruling coalition in Pakistan's Khyber Pakhtunkhwa province has announced to block supply route for NATO forces from November 23 as a protest against the drone strikes.

The cricketer-turned politician, Imran Khan, whose Pakistan Tehrik-e-Insaf party rules the province, has said the blockade of the route will continue unless the US stops drone attacks.

The issue of drone strikes is a source of tension between Pakistan and the US as Washington is in no mood to change its covert operation despite Islamabad's public condemnation.

The US insists Pakistan has failed to act against the al- Qaeda operatives and the Taliban militants in Waziristan tribal region who are accused of cross-border attacks into Afghanistan.