"On the basis of available facts and documents, that corrupt movement has been implementing a foreign mission in order to encourage unlawful activities, kill innocent people, create a rebellion, plunder public property and weaken the power of the Islamic system," Shariatmadari wrote.
He accused Mousavi and his ally, former President Mohammad Khatami, of serving as a "fifth column" for the West and of committing numerous crimes, including "the murder of innocent individuals, inciting riots and rebellions, hiring some thugs and ruffians to attack the lives, property and honor of the people."
He demanded that Mousavi and Khatami "be tried in an open court" for their "frightful crimes and overt acts of treason."
Mousavi and Khatami had delivered strong statements Wednesday describing Ahmadinejad's government as "illegitimate."
On Saturday, Mousavi's lengthy report on the election irregularities contained no smoking gun but was the most detailed account so far offered by the opposition leaders of the methods they allege Ahmadinejad and his allies used to tilt the vote.
They include allegations of misuse of official power, mobilization of government employees, cash payouts to militiamen and improper use of radio and television as well as accusations that millions of extra ballots without serial numbers were printed at the last moment while some pro-Mousavi districts ran out of ballots on election day. Mousavi alleges that government officials violated their own rules by sending ballot boxes directly to be counted without campaign observers present.
Mousavi also alleges that the Interior Ministry, which organized the election, is controlled by an Ahmadinejad ally who purged longtime employees and hired the president's loyalists. He charges that the Guardian Council, which oversaw the vote and a limited recount, was dominated by Ahmadinejad supporters
Meanwhile, as authorities continued to detain two Iranian employees of the British mission in Tehran, a military commander said preparations had been made to seize the leafy 50-acre British Embassy residence in the north Tehran district of Qolhak. The property has been owned by London since the 19th century, though some Iranian hardliners insist that the deed is a forgery.
A powerful cleric who is among Mousavi's top backers emerged from weeks of silence to acknowledge widespread dissatisfaction with the vote and its aftermath, though he denied that the election had created a deep rift within the establishment. The statement appeared to set up the cleric as a potential mediator in the dispute.
"The incidents which followed the election and the problems which were created for some individuals have distressed people," Ayatollah Ali Akbar Hashemi Rafsanjani, chairman of the Expediency Council, said during a meeting with families of those imprisoned in a crackdown on dissent.
"I do not think that any vigilant conscience could be satisfied with the current situation," he said, according to the semi-official Iranian Labor News Agency.
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daragahi@latimes.com
Special correspondent Ramin Mostaghim in Tehran contributed to this report.