Khaled Ali says the protesters were arrested on Saturday in front of the Egyptian Press Syndicate in downtown Cairo after rallying against President Donald Trump's move.
It wasn't immediately possible to reach the prosecutors today for a comment.
Ali says those detained, including a female activist, are accused of links to the Muslim Brotherhood group, Egypt's onetime largest Islamist group which was outlawed after the ouster of the Islamist President Mohammed Morsi in 2013.
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