Security forces and Islamist protesters have clashed around the country, leaving 51 killed, as a national holiday celebrating the military turned to mayhem.

Egypt is braced for a day of rival rallies and potential street clashes as Islamists condemned military leaders’ call for huge pro-army demonstrations.

Egypt’s first democratically-elected president is under house arrest after being overthrown by the military in the same kind of Arab Spring uprising that brought the Islamist leader to power just a year ago.

The armed forces ousted Egypt’s first democratically elected president today after just a year in power, installing a temporary civilian government, suspending the constitution and calling for new elections.