The first action of the new Pakistani government will be to seek the United Nation's help in uncovering who was behind the assassination of former premier Benazir Bhutto, Pakistan People's Party co-chairman and her husband Asif Ali Zardari announced on Thursday.

"Our first resolution, our first point of order on the day we take the oath of governance, will be to request the United Nations for helping us uncover the incident of Benazir Bhutto [Images]," Zardari told a joint press conference with Pakistan Muslim League-N chief Nawaz Sharif.

Zardari and Sharif held talks for two years on Thursday night as part of their efforts to form a national government after routing the ruling Pakistan Muslim League-Q.

Bhutto was killed after addressing an election rally in Rawalpindi on December 27, 2007.

The PPP had demanded an international probe on the lines of that of former Lebanese prime minister Rafiq Hariri, who was assassinated in a bomb blast in Beirut.

President Pervez Musharraf [Images] had rejected the PPP's demand for an international probe into the matter, saying the country had institutions in place to probe the killing.

Later, Pakistan government roped in Britain's Scotland Yard, which concluded that Bhutto died due to the impact of blast.