Also Friday, security officials said assailants detonated explosives on train tracks between Alexandria and the western Mediterranean Sea province of Marsa Matrouh. There were no injuries and no trains were damaged from the attack, officials said, speaking on condition of anonymity in line with regulations.
Egypt, the Arab world's most populous nation, has been in turmoil since Morsi was removed from power by the military on July 3, following days of mass protests against him and his Brotherhood group. But Morsi's supporters have remained defiant, demanding the coup be overturned. The international community has urged both sides in Egypt to show restraint and end the turmoil engulfing the nation.
On Wednesday, riot police backed by armored vehicles and bulldozers cleared two sprawling encampments of Morsi supporters, sparking clashes that killed at least 638 people.
The Brotherhood's political wing, the Freedom and Justice Party, said in a statement Friday that the group is not backing down and "will continue to mobilize people to take to the streets without resorting to violence and without vandalism."
"The struggle to overthrow this illegitimate regime is an obligation, an Islamic, national, moral and human obligation which we will not steer away from until justice and freedom prevail, and until repression is conquered," the statement said.
The group said in another statement that its protests were peaceful.
The revolutionary and liberal groups that helped topple Morsi have largely stayed away from street rallies in recent weeks.
Meanwhile, state-run and private television stations have been broadcasting footage from Wednesday's violence they say shows armed men firing toward security forces. Graphic videos have emerged online portraying the violence from the protesters' side.
One video, authenticated by The Associated Press based on landmarks and reporting from Wednesday's crackdown, shows armored personnel carriers driving protesters back from an area near the main sit-in as continuous volleys of automatic gunfire rang out.
In the footage, the crowd was shown retreating after throwing stones at the approaching vehicles, leaving several bloodied men motionless on the ground. After a loudspeaker announcement instructed the crowd to evacuate, promising safe passage, a vehicle approached and the barrel of a weapon emerged from one of its gun ports.
Associated Press writer Mariam Rizk contributed to this report.
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