At least seven civilians and a soldier were killed late Sunday when three rockets slammed into the restive Sinai Peninsula, Egypt's interior ministry and medical sources said.
One rocket fell outside a shop in the south of El-Arish, capital of north Sinai, killing the seven civilians, including a child, and injuring 25 other people, the ministry said.
Two rockets targeting a military post followed, killing one soldier and wounding three others, medical sources told AFP.
Security forces are struggling to quell an Islamist insurgency that has killed scores of soldiers and policemen in the peninsula bordering Israel and the Palestinian Gaza Strip.
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The attacks surged after the military overthrew Islamist president Mohamed Morsi last year, and the militants extended their reach to the Egyptian mainland with a series of bombings.
The attacks are mostly claimed by jihadists fighting against the bloody crackdown on Morsi supporters by the army after he was ousted in July 2013.
Since then 1,400 people have been killed in street clashes, and more than 15,000 Islamists and protesters have been jailed.
An Egyptian court on Sunday sentenced 101 Morsi supporters to three years in jail for acts of violence in the Nile Delta city of Damietta, state media reported.
At least 200 people have also been sentenced to death in speedy mass trials, including Mohamed Badie, leader of Morsi's Muslim Brotherhood movement.
Morsi himself is currently on trial in three separate cases, with a fourth yet to come to court.