ISLAMABAD - The head of US Federal Bureau of Investigation (FBI) Robert Mueller met Prime Minister Syed Yousuf Raza Gilani on Wednesday, Prime Minister House sources disclosed. Robert Mueller arrived here in the morning from New Delhi where he had held talks over Mumbai attacks investigations. FBI is collaborating with India in the investigation and has provided it with vital information. US embassy spokesman Jeremiah Knight, confirmed the arrival, but declined to give details of the meetings. The sources in the government disclosed that Robert Mueller had expressed satisfaction over Pakistan's findings with regard to the Mumbai attacks and hoped that both India and Pakistan would work jointly to bring the perpetrators to justice. During the meeting the Prime Minister Syed Yousuf Raza Gilani said that the government of Pakistan strongly had condemned the Mumbai carnage soon after it had happened. He also said that Pakistan had informed the world and India that Pakistan's soil and state were not involved the Mumbai attacks despite India's repeated allegations of Pakistan's involvement. Later, Advisor to the Prime Minister on Interior Rehman Malik briefed the FBI Director and his team over the development made so far in Mumbai terrorist attacks investigation. Secretary Interior Syed Kamal Shah, US Ambassador to Pakistan Anne W Patterson and other high-ups attended the briefing in which Pakistan handed over investigation report to the FBI Director, the sources added. On the occasion, Rehman Malik said that Pakistan had no aggressive design against any other country and want stable and better relations with all its neighbours. The sources also said that the FBI Director during the briefing said terrorism and extremism has become international issue and there is a dire need of joint efforts to tackle the menace. Admitting the fact that Pakistan is sincere in Mumbai investigation, Robert Mueller hoped India would also collaborate with Pakistan in this regard. The recent terrorists' attack on Sri Lanka's cricket team in Lahore was also discussed in length during the briefing, sources added. Robert Mueller also offered FBI assistance for investigation into the incident.