Egypt's military-backed interim government says it will put Muslim Brotherhood chief Mohammed Badie and one of his deputies on trial August 25 on charges of inciting violence.
Badie is at large while his deputy Khairat el-Shater is in a Cairo prison. They are accused of starting violence that led to the deaths of protesters outside Brotherhood headquarters in June - days before the military overthrew President Mohamed Morsi on July 3.
The Brotherhood and Morsi supporters have set-up two large round-the-clock vigils in Cairo, demanding his reinstatement.
Police helicopters dropped flyers over one of the camps Sunday, telling the protesters that the Brotherhood has "mentally kidnapped" them. The message says police will not harm demonstrators if they go home now.
The interim government has threatened to break up the protest camps, but now says it wants to give time for mediation.
It says there is a chance to end the protests without bloodshed while protecting the rights of all citizens. But it says the talks should take place in a "defined and limited" timeframe.
U.S. Deputy Secretary of State William Burns is in Cairo meeting with interim leaders. The United States is urging all sides in Egypt to stop the violence and put together a transitional government that includes all sides.