KABUL (Agencies) - Afghan President Hamid Karzai is reviewing his strategy for making peace with the Taliban after his top peace envoy was murdered, a spokesman said Sunday, as officials said the killer was Pakistani. Karzais pointman on Taliban talks, High Peace Council chairman Burhanuddin Rabbani, was assassinated last month by a turban bomber who had purported to be a peace emissary from the insurgents. A statement released by Karzais presidential palace Sunday said new evidence showed that Rabbanis killer was a citizen of Pakistan. Karzai spoke Friday of the need for discussions with Pakistan to bring peace and of his frustration at the failure of talks to establish contact with senior Afghan Taliban chiefs such as supreme leader Mullah Mohammad Omar. Evidence shows that Rabbanis death on September 20 was plotted in Quetta and the person who carried out the suicide attack... was a citizen of Pakistan, the statement said, quoting an official investigation team. Afghan officials have already said that Rabbanis murder was planned by the Afghan Talibans leadership body, the Quetta Shura, in Pakistan. But the militant group has not claimed responsibility for the killing. The statement added that the killer had been living in the Pakistani border town of Chaman, citing proof including documents and confessions of a man arrested last month in connection with the death. The statement also quoted investigators as saying: Documents and evidence together with the biography, address and phone numbers of suspects involved in the incident have been submitted to the government of Pakistan in order to arrest and hand them (other suspects) over. The claims came hours after a spokesman for Karzai, Siamak Herawi, said the president was reviewing his strategy for peace with the Taliban in the wake of Rabbanis killing. No substantive peace talks have yet taken place between the Afghan government and the Taliban, leaders of a 10-year insurgency which has led to 140,000 foreign troops being stationed in Afghanistan. All peace talks with the Taliban are suspended. The president will review the peace and reconciliation strategy, Herawi told AFP. The spokesman said Karzai was expected to announce a new strategy for peace efforts in a televised address very soon. The Taliban have long rejected Karzais calls for peace talks, saying they will not hold any discussions until all foreign troops leave the country. Rabbani had rushed back from Iran in order to meet his murderer when he was killed in Afghanistans highest-profile political assassination since a US-led invasion launched on October 7, 2001 ousted the Taliban. His death dealt perhaps the heaviest blow yet to Karzais hopes of securing reconciliation with the Taliban. Karzai spoke of his frustrations over the process at a meeting with clerics Friday, where he also stressed the importance of negotiating with Pakistan in a bid to end the war. Mullah Omar doesnt have an address... their peace emissary turns out to be a killer, whom should we talk to? Karzai asked the clerics. The Afghan nation asks me whos the other party that you hold talks with? My answer is, Pakistan. Afghanistan foreign ministry spokesman said Sunday that the Afghan government needs to see Pakistan making tangible progress on pledges to use its influence to help end the Taliban insurgency. Afghanistan has invested a great amount of goodwill and political capital to create an atmosphere of trust and confidence and to try to improve relations with Pakistan over the past three years, the spokesman, Janan Mosazai, told reporters in Kabul. Unfortunately, we have not been witness to the type of concrete progress that we were expecting - that was promised to us by our brothers and sisters in Pakistan, he added. For his part, Karzai has suspended a series of trilateral meetings between Afghanistan, Pakistan and the United States because of the fallout. When it comes to specific examples of tangible progress that we would like to see, it is facilitation of direct negotiations with the Taliban leadership and with any other insurgent leaders who are prepared to join the Afghan national reconciliation process, Mosazai said. Mosazai said an Afghan delegation would travel to Pakistan, possibly as early as Sunday night, to discuss the peace process and the allegations that Pakistan had a role in the recent assassination of Rabbani.