Benazir Bhutto was poised to reveal proof that Pakistan's election commission and shadowy spy agency were seeking to rig an upcoming general election the night she was assassinated, a top aide said on Tuesday.

Senator Latif Khosa, who authored a 160-page dossier with Bhutto documenting rigging tactics, said they ranged from intimidation to fake ballots, and were in some cases unwittingly funded by U.S. aid.

Bhutto had been due to give the report to two visiting U.S. lawmakers over dinner on December 27, the day she was killed in a suicide bombing.

"The state agencies are manipulating the whole process," Khosa, a top Bhutto aide and head of her Pakistan People's Party election monitoring unit, told Reuters.

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"There is rigging by the ISI (Inter-Services Intelligence), the election commission and the previous government, which is still continuing to hold influence. They were on the rampage."

President Pervez Musharraf's spokesman Rashid Qureshi dismissed the claim as "ridiculous".

"It makes one laugh," he said. "The president has said a free, fair, transparent and peaceful election is essential, which forms part of his overall strategy for transforming Pakistan into a fully democratic (nation)."

"Benazir's coming back to Pakistan was part of a national reconciliation ordinance," he added. "Take it from me, it's going to be perhaps the best election that Pakistan has ever had."

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