A Cairo appeal court today ordered the renewal of 62-year-old Morsi's detention for 30 days pending investigations into his suspected collaboration with Hamas.
Morsi is facing charges of collaborating with Hamas in attacks on police stations and prison breaks in early 2011 during the uprising against former president Hosni Mubarak.
Egypt's first democratically elected leader, Morsi was ousted by the army on July 3 after mass protests against him on the anniversary of his election. He has been held by the army at an undisclosed location since then.
He is also charged with attacking police stations and with the intentional killing and abduction of police officers and prisoners during the uprising, in addition to charges of espionage. Many Islamist leaders, including Morsi, escaped during the prison breaks.
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The detention of Saad El-Katatni, the leader of the Freedom and Justice Party, the political arm of the Muslim Brotherhood, was also renewed for 15 days in the same case.
The health ministry said the death toll from nationwide violence in Egypt has climbed to 525, making it the bloodiest day since the Arab Spring in 2011.
A defiant Brotherhood has said it planned to march in the capital, Cairo, today against the crackdown that, it claimed, left 2,000 people dead.