The army enforced a dawn-to-dusk curfew in the Egyptian capital Cairo on Sunday (August 18), as the city's frenetic streets, unusually empty in the past few days, were returning to normal.

But the army kept several big squares closed.

At night, soldiers standing by armoured personnel carriers manned checkpoints and vigilantes inspected cars for weapons.

The Muslim Brotherhood, who has been demanding the reinstatement of deposed president Mohamed Morsi, has called for daily street protests this week, but there were no reports of trouble by Sunday evening.

More than 800 people have died since Wednesday after the authorities launched a crackdown on Brotherhood supporters staging sit-ins against the army's ouster of Morsi on July 3.