The United Nations' human rights chief has expressed concern at the arrest of key members of Egypt's Muslim Brotherhood, as supporters of the country's ousted president called for a further wave of protests.
Navi Pillay said there should be "no more violence, no arbitrary detention, no illegal acts of retribution" following the military intervention that forced Mohamed Morsi from office.
Mr Morsi is believed to have been placed under house arrest since Egypt's top judge, Adli Mansour, was sworn in as interim president.
At least four of his aides and advisers are also being held.
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