Benazir Bhutto was slain just hours before she was to go public with "proof" that Pakistani intelligence and electoral officials were planning to rig polls, an official from her party said on Tuesday.
Opposition leader Bhutto was to unveil a report she had written about the plot to rig the country's general elections at a press conference on Thursday night after giving it to visiting US lawmakers, said Senator Latif Khosa.
She was assassinated in a gun and suicide bomb attack at a campaign rally on Thursday afternoon. "Bhutto was scheduled to reveal a document containing proof of rigging plans by the election commission and Inter-Services Intelligence the night she was assassinated," Khosa told AFP.
"It was a 160-page document 'Yet another stain on the face of democracy', which Bhutto was to unveil at a press conference in Islamabad on December 27 after meeting the two visiting US lawmakers," he said.
"But that was not possible because she was murdered." Khosa did not give the names of the US lawmakers said to have been visiting. Pakistan government officials were not immediately available for comment.