Three top officials of Egypt's Muslim Brotherhood will go on trial on August 25 on charges of inciting members of their group to kill rioters in front of its headquarters, a Cairo court ruled. The charges relate to mass disturbances that led to the ousting of President Mohammed Mursi on July 3. Although the authorities have detained dozens of Brotherhood members since Mursi's fall from power, the case against the group's spiritual leader, his deputy and another key figure is the first to be scheduled for trial. The pending prosecutions are a new blow to the Brotherhood, which emerged as the country's strongest political movement after the overthrow of President Hosni Mubarak in 2011, but has seen all of its newfound power stripped away in just weeks. The scheduling of the trial is likely to complicate political and diplomatic efforts to persuade Mursi's supporters to break up two large sit-ins in Cairo. Egypt's new military-backed government has said it will not let the sit-ins continue indefinitely, but many fear efforts to forcefully disperse the protesters would unleash new violence. The prosecutions could be an effort to put more pressure on the group to strike a deal to end the current crisis, said Shadi Hamid of the Brookings Doha Centre. The case concerns events during the final days of Mursi's tenure, when hundreds of rioters - equipped with stones, petrol bombs and firearms - attacked the Muslim Brotherhood's headquarters in Cairo and tried to burn those inside alive. Police did not intervene, but men inside the darkened building fired guns from the windows. Officials said eight people were killed outside the building and a video posted online showed one badly beaten man being dragged from the building. Accused of incitement to murder in the case are the Brotherhood's supreme guide, Mohamed Badie; his deputy, Khairat el-Shater; and another official, Mohamed Bayoumi. Three more defendants have been charged with murder and arms possession and an additional 29 have been accused of using force, terrifying residents and attacking a police officer.