Egypt's interim presidency says international efforts to resolve the political crisis which followed the deposing of Mohammed Morsi have failed.
Interim head of state Adly Mansour and his backers in the military have been talking to diplomats from the US, EU, Qatar and the United Arab Emirates.
More than 250 people have been killed in political unrest since Mr Morsi was ousted on 3 July after street protests.
Two US senators on Tuesday called for mediation with his Muslim Brotherhood.
The Netherlands' foreign minister was the latest foreign envoy due to hold talks with his Egyptian counterpart, the prime minister and the president and other officials on Wednesday.
Supporters of the former president have held daily street protests in Cairo and other cities.