Prime Minister Syed Yusuf Raza Gilani left Washington Tuesday evening for Pakistan at the end of a three-day visit during which he attended a major nuclear security summit and discussed bolstering Pakistan-US relations with President Barack Obama. Islamabads ambassador to the United States Husain Haqqani and senior State Department officials saw off the prime minister. Foreign Minister Shah Mahmood Qureshi and Pakistan chief negotiator for the nuclear summit and ambassador to China Masood Khan accompanied the prime minister. The prime minister also held bilateral meetings with several world leaders on the sidelines of the Nuclear Security Summit, which was attended by some 47 countries.