A key leader of the Afghan militant group, the Haqqani network, has categorically stated that it was not responsible for killing Burhanuddin Rabbani, the man overseeing Taliban peace talks, attacks in Kabul and has no links with the Pakistan spy agency, the ISI. Afghan officials have blamed the Taliban-affiliated network for the suicide attack on Rabbani. Siraj Haqqani told BBC Pashto service in an audio interview to written questions that his network was not linked to Pakistan's spy agency, the ISI. Siraj Haqqani is the son of group founder Jalaluddin Haqqani and has a key role in its operations. Security considerations ruled out a face-to-face interview in which the answers could be challenged, but the BBC understands that the audio response is genuine. The questions were delivered through an intermediary, who returned with the audio response. In his interview response, Siraj Haqqani simply says: "We haven't killed Burhanuddin Rabbani and this has been said many times by the spokespersons of the Islamic Emirate." Siraj Haqqani used his BBC interview to deny taking orders from the ISI. Don't expect that to make any difference to the diplomatic offensive Afghanistan is waging against Pakistan now, in the belief that the ISI is indeed waging a proxy war on its soil, using groups like the Haqqanis. Mr Haqqani said that during the Soviet occupation of the 1980s, mujahideen fighters "had contacts with the intelligence agencies of Pakistan and other countries, but after the invasion by the Americans there have never been contacts by intelligence agencies of other countries which could be effective for us". He said accusations of links to the ISI were an attempt "to hide their failure and to confuse peoples' minds". Siraj Haqqani did say that the Americans had been in touch - to try to persuade him to enter talks with the Afghan government. That statement is credible, given the efforts which have apparently been going on behind the scenes to get some kind of peace process going. Mr Haqqani said the "Islamic Emirate" was behind "the attack on the US embassy, Nato headquarters and other attacks" in Kabul, which he said were ordered by a "military council" and were not the work of individuals. He said the Haqqanis "have been contacted and are being contacted by intelligence agencies of many Islamic and non-Islamic countries, including the US, asking us to leave the sacred jihad and take an important part in the current government". Mr Haqqani said that was not his network's responsibility, but he added: "We know that their aim is not peace, they want to create tension among the Emirate's mujahideen." A senior Afghan intelligence official rejected the Haqqanis' denial of links to the ISI, saying the group was the ISI's creation. "The ISI gives the network intelligence, tactical advice and training. Groups like Lashkar-e Taiba give [the network] fighters and share information and experience about battles," the official told the BBC. "We know for sure that Lashkar-e Taiba fighters come and fight alongside the Haqqani network. The Haqqanis fight alongside Lashkar-e Taiba in Kashmir. They have a long-standing relationship." Mr Haqqani vowed that "the game which is being played by the West is close to an end".He pledged loyalty to Mullah Omar, saying he "is our leader and we totally obey him". "In every operation we get the order, planning and financial resources from the Emirate's leadership and we act accordingly," Mr Haqqani said. He also delivered a message to the "government and people of Pakistan", telling them to be "careful of their Islamic values. They should understand that America will not let Pakistan live a peaceful life until it destroys all the wealth and values of it." After Rabbani's death, Afghan President Hamid Karzai said his government would no longer hold peace talks with the Taliban, but would instead focus on dialogue with Pakistan. "The Afghan nation asks me who's the other party that you hold talks with? My answer is, Pakistan." Karzai had said.