The UN chief demanded that Morsi and senior Muslim Brotherhood leaders “be released or have their cases reviewed transparently without delay,” UN deputy spokesman Eduardo del Buey said on Friday.

With tensions again rising in Egypt ahead of rival rallies by followers of Morsi and the army, the spokesman said Ban "is following closely, and with growing concern, developments in Egypt.

The secretary general once again urges all sides to act with maximum restraint, del Buey noted, adding he supports the rights of all Egyptians to hold peaceful protests.

"He calls on the interim authorities to ensure law and order along with guaranteeing the safety and security of all Egyptians."

Ban "renews his calls for a meaningful national dialogue and an inclusive reconciliation process. The aim must be to chart a peaceful path towards a full return of civilian control, constitutional order, and democratic governance," said del Buey.

Dozens of people have died and hundreds more have been injured in deadly clashes between Morsi supporters and security forces over the last month clashes.

Morsi became Muslim Brotherhood’s first president on 30 June 2012, after winning an election considered free and fair following the 2011 revolution that toppled Hosni Mubarak.

However, Morsi first year in office has been marred by constant political unrest and a sinking economy, which led to his removal from power on July 3.

NTJ/BA