US Deputy Secretary of State William Burns met Foreign Minister Nabil Fahmy hours after seeing members of Morsi's Muslim Brotherhood and its political arm, the Freedom and Justice Party.
    
The talks came as the Washington Post published an interview with army chief General Abdel Fattah al-Sisi, who lashed out at Washington, urging it to pressure Morsi supporters to end their rallies.
    
Tensions have mounted over a looming police move to dismantle two Cairo sit-ins by Morsi loyalists, though Fahmy insisted that authorities had "no desire to use force if there is any other avenue that has not been exhausted."
    
"There is an open invitation for all political forces to participate. The door is open for everybody, including the Brotherhood, to participate in the process," Fahmy added, at a press briefing.
    
Morsi has been formally remanded in custody on suspicion of offences committed when he broke out of prison during the 2011 revolt that toppled former president Hosni Mubarak.
    
The Islamist leader, who has been held at an undisclosed location since the coup, refused to talk to the investigating judge in a meeting yesterday, said Mostafa Azab of the "Lawyers Against the Coup" movement.
    
Morsi "refused to talk to him and told him he didn't recognise any of the measures being taken against him," Azab said, adding that the former president had refused to call a lawyer.
    
Earlier, the interior ministry urged pro-Morsi demonstrators to go home, saying this would allow the Brotherhood to return to politics.

(Agencies)

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