CAIRO
Army and police forces sealed off all routes leading to the square, the scene of a six-week protest camp in support of the ousted leader.
Security forces also blocked the Dewal Arabiya Street, a main artery in western Cairo.
Security measures have also been beefed up in the canal city of Suez, with troops checking passing vehicles.
The National Alliance for the Defense of Legitimacy, a coalition of largely Islamist bodies and figures supporting Morsi, has called for mass protests on Friday to mark one month since a bloody crackdown on two pro-democracy sit-in camps in Cairo and Giza.
On August 14, Egyptian security forces violently dispersed the two major pro-democracy camps in Rabaa al-Adawiya, eastern Cairo, and Giza's Nahda Square.
The bloody crackdown left hundreds dead and thousands injured. At least 288 of those killed had been in the larger of the two protest sites in Rabaa, while 90 were killed during the dispersal of a smaller camp at Nahda near Cairo University.
Egypt has been in turmoil since the powerful military deposed Morsi, the country's first democratically elected president, on July 3 after mass protests against his presidency.
The unconstitutional change of government is described by the ousted president's backers as a "military coup," while the move's supporters call it a military-backed "popular uprising."
englishnews@aa.com.tr
