WASHINGTON - There is no evidence so far that anybody in a senior position in the Pakistan Army or the ISI had any knowledge about the presence of Osama bin Laden at the safe house in Abbottabad, a top Pentagon official has said. Im privy now to an awful lot of what weve seen as a result of what he had in his house, where he was living, and I just havent seen anything yet that would confirm that anybody in a senior position had any idea he was there, Admiral Mike Mullen, chairman of the US Joint Chiefs of Staff, told the Charlie Rose show in an interview on Tuesday. ...I just havent seen anything that would lead me to believe, any evidence that the ISI knew about it, that the Pak military knew about it, he said. The top Pentagon official said that he has seen evidence that bin Laden lived at the Abbottabad compound for five years. He said the US raid on bin Ladens safe house was the culmination of the focus that America had put on finding and capturing or killing the top Al-Qaeda leadership. When we went in, certainly hes been the number one target for us for a long time, but when we went in, the status of Al-Qaeda has been significantly damaged over the course of the last two or three years, he said. So theyre a much different organisation than they were when President Obama came in. But we have been focused on this for a decade. This was the best certainly Id ever seen action between the CIA and the Pentagon. And there were other agencies involved as well, he said. Mullen said the US has brought as much pressure and discussion as it could on Pakistan to take action to eliminate that threat. Thats just part of what were going through with them right now. From an Al-Qaeda standpoint, what the Pakistan leadership tells me the military leadership is that they dont want them there either. And you know, we continue to work through the relationship in terms of how we work together to eliminate that threat. I think (Mullah) Omar and Quetta the whole Taliban thing and see, you can extend this to the Haqqani network, which is the Taliban network which focuses on Eastern Afghanistan, Mullen said. Amid Indias concerns over the danger of Pakistans nuclear arsenal falling into the hands of terrorists, US Commander Mike Mullen said Islamabads atomic weapons are secure. We have actually expended resources in support of assisting them (Pakistan), our government has, not the Pentagon, and they have responded positively in that regard, Admiral Mullen, Chairman of the Joint Chiefs of Staff, told the Charlie Rose Show. So they are certainly aware of those concerns, they have them themselves. I see them learning in that regard, so the trend from my perspective is in the right direction, and where we are as we speak is that those weapons are secure and Im comfortable with that, he said. Mullen said he has raised the concern about the security for nuclear weapons many a time with Pakistani army chief Gen Ashfaq Parvez Kayani and ISI head Lt Gen Ahmed Shuja Pasha. His comments came days after Defence Minister AK Antony voiced concern over the danger and threat of Pakistans nuclear arsenal falling into the hands of terrorists and said India was closely monitoring the situation in the neighbourhood. Our only worry is that Pakistans nuclear arsenal is always in danger and threat of going into the hands of militants and terrorists.... We are closely monitoring the happenings around us, Antony said in New Delhi when asked about American media reports on Pakistans nuclear stockpile. Acknowledging that questions are being raised about the US aid to Pakistan, Mullen said yesterday that it is for the Congress to decide. Certainly (there) has been an enormous amount of discussion since the bin Laden raid about that. I think were working our way through any adjustments which may occur, he said. Certainly, we have expectations that this aid will be challenged and that it will be discussed, in terms of focus. And discussed in terms of, you know, 'If you do this, well do this, kind of thing. Its a significant amount of money. We know that, he said. I believe if we walk away from that part of the world, well be back in 10 or 20 years. Itll be much more viral than it is right now, as has been the case, since we left in 1989. So I think we all have to work together to keep this going, to bring the pressure we can, and to try in particular, on the development side, the economic side. And in the end, thats really the answer in Pakistan, to focus there as well, Mullen said. Agencies add: The top US military officer vowed long-term commitment to Afghanistan, touting progress in the war against the Taliban and its Al-Qaeda allies ahead of an American drawdown. Admiral Mullen said that although some troops would be withdrawn, a continued US presence was assured. Since Ive been out there in the last three and a half, four years, its still the leading question is, 'You left us before, are you going to leave us again? he said. A couple years ago I got to the point where theyre only going to believe were going to be there if were there... and certainly there will be some troops that come out this summer... and yet that isnt a message that were leaving. President Barack Obama is expected to decide in the coming weeks whether or how many of the 100,000 US troops to withdraw from Afghanistan starting next month, the first stage of a drawdown he initially promised in mid-2009 but later de-emphasised. Authority is due to be turned to the Afghans in full in 2014. In 1989, the United States essentially turned its back on Afghanistan after CIA-backed insurgents beat out Soviet forces toward the end of the Cold War. A civil war ensued and the Taliban eventually gained control. But Mullen insisted America would not repeat its past mistakes. While hailing the fragile progress made in the 18 months since Obama announced a troop surge to push back the Taliban and buy time for Afghan political and security development, Mullen declined to indicate just how many troops may return home initially. Were not picking any numbers yet, Mullen said. Whatever that number is from a standpoint of the overall campaign, Im comfortable weve made enough progress where we can take out a number and continue to make progress in the campaign, and move to 2014 in transition. He pointed to a very aggressive agenda to turn the security over by the end of 2014 and to have the governance process and the development process enough in support so that the country can be secure. The Pentagon, led by outgoing Defense Secretary Robert Gates, seeks only a cautious drawdown from a war that has killed around 1,500 US troops. Meanwhile, the top American military man warned Wednesday that the United States must continue to work with Pakistan as a partner despite years of mistrust. Mullen said Pakistan remains critical to US strategy. We must continue to pursue a partnership with Pakistan, Mullen told the Senate Appropriation panels defence subcommittee. The alternative - drifting toward a more contentious or fractured relationship - is far more detrimental to US interests in strategically defeating Al-Qaeda and ensuring nuclear weapons do not fall into terrorists possession. Defence Secretary Robert Gates appeared with Mullen to give his last testimony before his retirement at the end of the month. When asked about rocky relations with allies such as Pakistan and Afghanistan, Gates offered some political reality on global diplomacy. Senator Patrick Leahy, D-Vermont, asked Gates how long the United States should support governments that lie to us, adding: When do we say enough is enough? Gates responded that based on 27 years in the CIA and four and a half years in this job, most governments lie to each other. Thats the way business gets done. Do they also arrest the people that help us when they say they are allies? Leahy asked in clear reference to Pakistans actions against officials who helped the US raid on bin Ladens compound. Sometimes, Gates said, and sometimes they send people to spy on us and they are our close allies. Thats the real world that we deal with.