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He said the plotters “were supported by internal criminal elements with the aim of undermining Egypt’s international and regional standing and attempting to destabilize its political, security and economic stability.” The plot involved “killing peaceful protesters, storming prisons to free terrorist and criminal elements, vandalizing public and private properties and burning policemen inside their vehicles.”

Dozens of policemen also were killed during the uprising, many during attacks on police stations and prisons.

Mr. el-Adly offered his condolences to the families of those killed, prompting lawyers in the room to shout, “Butcher! Execution!”

Six other ranking security officers are being tried in the same case. Two of them, plus Mr. Mubarak and Mr. el-Adly, could be hanged. Mr. Mubarak; his sons, Gamal and Alaa; and a close associate are being tried in a separate case on corruption charges.

Also Wednesday, Amnesty International said Egyptian security forces had used excessive force against demonstrators earlier this month, killing 16 and injuring many more.

Protesters took to the streets in Cairo and the canal town of Suez following the killing of 74 people at a soccer match. They blamed police for not stopping the attackers.

Over the next five days, Amnesty said, police used “excessive force, including firearms, to disperse angry protests.”

While most demonstrators protested peacefully, some threw rocks and launched fireworks at police.

The London-based group said the protesters’ deaths show that Egypt’s new government has yet to reform its police force, despite many promises to do so since Mr. Mubarak’s fall.

“The recent use of excessive force by the security forces show a complete disrespect for human life,” Amnesty’s Hassiba Hadj Sahraoui said in a statement.