As Egypt faces the gruesome aftermath of clashes that left hundreds dead, demonstrators plan to defy an emergency order and take to the streets to mark "Friday of anger."

The Muslim Brotherhood promised huge protests and Egypt's military government showed no sign of easing its crackdown, setting the stage for what could become another catastrophic encounter of security forces and protesters.

The Egyptian army blocked all entrances and exits of Cairo's Tahrir Square with armored vehicles and barbed wire in anticipation of new protests, state-run EGYNews reported.