CAIRO: Egypt's Muslim Brotherhood said on Monday that 35 supporters of ousted president Mohamed Morsi were killed at dawn when security forces opened fire on them as they were praying.

“Morsi supporters were praying while the police and army fired live rounds and tear gas at them. This led to around 35 dead and the figure is likely to rise,” the Brotherhood said in a statement.

Earlier, the Egyptian armed forces said “armed terrorists” had tried to storm the headquarters of the elite Republican Guard, where the Brotherhood had been protesting, leaving one security officer dead.