ISLAMABAD (AFP) - Pakistani government and Taleban negotiators Friday expressed concern over a wave of deadly attacks in the country, agreeing that both militants and security forces should refrain from actions which undermine ongoing peace efforts.

The Pakistani Taleban claimed credit for a bomb blast that killed 12 policemen on a bus in the port city of Karachi on Thursday, the latest in a series of near-daily attacks since the government called for peace talks with militants to end their seven-year insurgency.

"Both the committees expressed deep grief and regret over anti-peace activities and declared that such incidents would have a negative impact on the peace efforts," a joint statement said after government and Taleban committees met on Friday.

"Referring to the recent incident in Karachi, the government committee adopted the stance that it would become difficult to continue the peace talks when anti-peace activities continue," it said.

"Therefore the Taleban must be asked to make an announcement that they are stopping all kinds of anti-peace activities and implementation of this announcement should be ensured," the statement quoted the government side as saying.

It said that the Taleban committee "agreed" to the demand and asked the government to also make an announcement that it will not take any action which would create unrest.

"For lasting peace no side should use force," the statement quoted the Taleban side as saying.

The chief of the Taleban committee, Maulana Samiul Haq, has called for a session of religious leaders on Saturday to "take the clerics into confidence" regarding the peace negotiations.

Pakistani troops have been fighting for years against homegrown insurgents in the tribal belt, which Washington considers the main hub of Taleban and Al-Qaeda militants plotting attacks on the West and in Afghanistan.

Nearly 7,000 people have been killed in the TTP insurgency since it began in 2007, according to an AFP tally.

The start of 2014 has seen a surge in militant violence with more than 130 people killed.

An air force bombardment of TTP hideouts in North Waziristan led many to believe a major military offensive was imminent until Prime Minister Nawaz Sharif announced the peace talks.

Stability in nuclear-armed Pakistan is seen as important to neighbouring Afghanistan, where US-led NATO troops are pulling out after more than a decade of war.

Washington has said it is watching the talks with the Taleban closely. It has long been pushing Pakistan to take action against militants using Pakistan's tribal areas as a base to attack NATO forces across the border.