Anti-government protesters hurled rocks and petrol bombs at the presidential palace in Cairo on Friday, chanting slogans against Mr. Morsi and his Muslim Brotherhood group.

Egyptian security arrested 93 people in connection with violence that erupted during mass protests held against Islamist President Mohamed Morsi, an official at the Interior Ministry said on Saturday.

Anti-government protesters hurled rocks and petrol bombs at the presidential palace in Cairo on Friday, chanting slogans against Mr. Morsi and his Muslim Brotherhood group.

Clashes erupted when security forces first responded by firing warning shots in the air and used water cannon and tear gas to disperse the protesters.

Eight people were arrested in Cairo, while 31 were detained in the coastal city of Alexandria and 50 in the Delta city of Gharbia, where clashes between police forces and protesters also broke out.

Violence injured more than 120 people nationwide.

Protesters and opposition groups accuse Mr. Morsi of tightening the Brotherhood’s hold on power and failing to stop police abuses.

For their part, Islamists accuse the secular-minded opposition of seeking to unseat Mr. Morsi, Egypt’s first democratically president.

Nearly 60 people have been killed in anti-government protests across Egypt in the past two weeks.

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