Egypt's state security prosecutors ordered on Sunday that a prominent opposition leader, Hazim Abdelazim, be detained for 15 days pending investigation over joining an illegal organization and publishing false news, a judicial source said.
Egypt has in recent weeks arrested several prominent activists in a crackdown on critics that followed small protests against hikes to metro fares.
Abdelazim was arrested at his home in Cairo late on Saturday night, a security source had said earlier.