Prime Minister Syed Yousuf Raza Gilani will lead the Pakistan delegation to the 16th SAARC Summit in Thimphu, Bhutan being held on April 28-29. The heads of state and government of Afghanistan, Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan and Sri Lanka are attending the Summit, Foreign Office said on Friday. Representatives from the observer states will also be participating in the Summit. Currently China, Iran, Japan, South Korea, Mauritius, Myanmar, Australia, United States, and European Union are Observers. The Summit will be preceded by the Council of Ministers and meeting of the Standing Committee.