[JURIST] Security forces in Egypt arrested 516 supporters of the banned Muslim Brotherhood [BBC profile], Interior Minister Mohamed Ibrahim announced Monday. On Sunday, which marked the fourth anniversary of the 2011 uprising and the fall of Hosni Mubarak [BBC profile], supporters of the Brotherhood and ousted president Mohamed Morsi [BBC profile] battled with security forces while rallying against President Abdel Fattah al-Sisi’s [BBC profile] government. Twenty people were killed during the demonstrations in addition to the 516 arrested. Ibrahim stated [Telegraph report], “We confirmed, beyond the shadow of a doubt, that all those who took to the streets yesterday were Muslim Brotherhood elements alone. … We arrested 516 elements from the Muslim Brotherhood group who were involved in firing ammunition, planting explosives and bombing some facilities.” The arrests were the largest police sweep of Morsi supporters since Sisi took office in May.

The Muslim Brotherhood has been in crisis since Morsi left office in 2013. Last week an Egyptian court ordered a retrial [JURIST report] for 152 Muslim Brotherhood supporters sentenced in a mass trial last year. Also earlier this month, Egypt’s Court of Cassation ordered a retrial [JURIST report] for three Al Jazeera journalists jailed for falsifying news reports and associating with the Muslim Brotherhood. In December an Egyptian criminal court sentenced [JURIST report] 188 Muslim Brotherhood supporters to death for an August 2013 attack on a police station in the governate of Giza, widely known as the “Kerdasa massacre.” In November Egyptian authorities arrested [JURIST report] a top Muslim Brotherhood member who played a key role in negotiations between the group and the Egyptian government.