A prominent former presidential candidate has been put by Egyptian authorities on a terrorism blacklist, reported the state news agency MENA.
Abdel Moneim Abul Fotouh is accused of joining an illegally formed group and spreading false news in Egypt that could harm its interests. He will remain on the list for five years, said a judicial official.
He was arrested on Wednesday after joining a call to boycott next month's presidential election.
Fifteen others were also put on terror lists. Their identities have not been revealed.
Abul Fotouh, a 67-year-old physician quit, the Muslim Brotherhood in 2011 after disagreements over the role of religion in politics and founded the more centrist Strong Egypt party.
He mounted an independent bid for the presidency in 2012 and took nearly 18 percent of the vote in the first round of elections.
Egypt banned the Brotherhood in 2013 after President Mohammed Morsi was ousted by the military following mass protests. The group has since been declared a terrorist organization by the government but it maintains that its activities are peaceful.
