LONDON - Pakistans Inter Services Intelligence (ISI) and the US have started the joint operation to kill Baitullah Mehsud, The Daily Telegraph has reported quoting intelligence sources. A Pakistani intelligence official told the British newspaper that Washington had agreed to target Mehsud after months of persuasion by Islamabads military leadership. According to the report, Pakistan will pass on intelligence about Mehsuds movements with the aim of guiding a missile attack from an American drone. In public, Pakistans govt opposes all strikes of this kind as an invasion on the countrys sovereignty. Behind the scenes, however, Pakistans govt is quietly passing on targeting information to the Americans. We are mounting joint operations against Baitullah Mehsud which will hopefully soon show results, said the official. Mehsud, who is based in the tribal area of South Waziristan, threatened to target America after he claimed responsibility for the attack on a police training centre in Lahore on Monday. The intelligence official said that Pakistan had twice given America intelligence about Mehsuds whereabouts so that he could be targeted. But he claimed the information had been ignored. He was travelling on a road from point A to point B, and twice we tipped off America, said the official. But nothing happened. That raised a question mark over America as an ally for us. American commanders now view Mehsud as a major threat. He is deemed to have links to Al-Qaeda and last month he joined an alliance of Taliban leaders from across the border in Afghanistan who are preparing to counter President Barack Obamas deployment of more US troops in the country. Mehsud has also attacked supply convoys for Western forces in Afghanistan, which travel through Pakistan and cross the north-west frontier via the Khyber Pass. Targeting Mehsud may help to rebuild trust between Pakistans Inter-Services Intelligence agency (ISI) and the Americans. The Pentagon has accused the ISI of colluding with Taliban fighters. For their part, ISI officials say that America is too close to Pakistans old enemy, India. They suspect that Washington is levelling these accusations to create a pretext for sending US troops into Pakistan or widening its missile attacks beyond the tribal areas, said the report