Egypt's authorities have arrested Amir Ali, leader of the April 6 youth activist group that was influential in the uprising that overthrew ex-dictator Hosni Mubarak in 2011, the group said on its Facebook page.
State security officials arrested Ali in Shebin El-Kom district late on Tuesday in Menoufeya governorate, north of the capital, Cairo, according to Al-Ahram Online, quoting the group.
The reasons for Ali's arrest were unclear, Al-Ahram Online cited the group as saying.
An arrest warrant issued against Ali in June after an April 6 member was arrested in Cairo for distributing flyers calling for a strike, Al-Ahram quoted Khaled Ismail, a member of the movement's political office, as saying in a statement.
Ali was not arrested at the time, however, and the April 6 member was released, but Ali's arrest on Tuesday could be connected to that warrant, Ismail said in the statement.
Ali was elected as the April 6 Youth Movement coordinator in October 2013, succeeding its founder and long-time coordinator Ahmed Maher.
Maher is currently serving a three-year jail term – along with prominent activists Ahmed Douma and Mohammed Adel – on charges of holding unauthorised demonstrations and using force against the police.