Pakistan cannot bring Taliban to peace talks "and be asked to kill them at the same time", Prime Minister Nawaz Sharif has said.Islamabad is prepared to help revive stalled peace talks between Afghanistan government and Taliban and Sharif has talked about it with Afghanistan President Ashraf Ghani, Khaama press quoted him as saying on Friday at the US Institute of Peace.Sharif's remarks came after Kabul asked Islamabad to crack down on the Afghan Taliban and other terrorist groups that carry out attacks in Afghanistan with their centres in Pakistan.Afghan government said if Pakistan really wants to assist Afghanistan, it should stop supporting the terrorist groups.Sharif's speech at the US Institute of Peace was disrupted when a protester stood up shouting slogans of freedom for Balochistan province of Pakistan.A man in the audience stood up and shouted "free, free Baluchistan!" and accused Sharif of being "friends" with late Al Qaeda leader Osama bin Laden.