The Muslim Brotherhood has condemned the arrest of its spiritual leader Mohamed Badie over allegations of incitement to violence and murder.
A Brotherhood spokesman claims Badie's arrest is part of a plot against the 2011 revolution that ousted Hosni Mubarak.
The United States has also criticised the arrest saying it violates his human rights.
Egypt's former Vice President Mohamed ElBaradei is also facing charges of breaching national trust.
That is after he resigned from the government in protest against the military's crackdown on anti-coup protests.
One of the United States most experienced diplomats Jeffrey Feltman - now with the UN - has arrived in Cairo for a new round of talks to address the crisis.
Feltman is the first senior UN figure to visit since the June 30 protests and the overthrow of President Mohamed Morsi.
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