A man with a pistol, second left, and opponents of Egypt's former President Mohamed Morsy detain a suspected Morsy supporter who was wounded during clashes in Cairo, Egypt, on Monday, July 22. Supporters and opponents of Morsy's clashed Monday near Tahrir Square, leaving at least one person dead. Photo: CNN

The nation's military ousted Morsy, the country's first democratically-elected president, in early July after days of mass demonstrations. He has been held in detention since then while an interim government took shape.

The military has not commented on Morsy's whereabouts. When he was first detained, a Muslim Brotherhood spokesman told CNN that the deposed leader was initially under house arrest at the presidential Republican Guard headquarters in Cairo and later moved to the defense ministry.

United Nations Secretary-General Ban Ki-moon called for the immediate release of Morsy and other detained leaders "or have their cases reviewed transparently without delay."

This week, Gen. Abdel Fattah al-Sisi, the head of the military, called for mass demonstrations Friday to support the country's armed forces.

Morsy's opponents are calling on people to turn out to support the new government and protest "against terrorism."