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US senators John McCain and Lindsey Graham are due to arrive in Cairo as diplomatic efforts to end Egypt's political crisis intensify, BBC reported. 

US and EU envoys have been meeting officials from the military-backed government and supporters of ousted President Mohammed Morsi.

Their talks took place amid mounting tension over plans to break up two mass sit-ins by Morsi loyalists in Cairo.

A government helicopter dropped leaflets urging people to leave.

The pamphlets, which were dropped over the Rabaa al-Adawiya square, pledged protesters would face no action if they had not committed a crime whilst demonstrating.

More than 100 Morsi supporters have been killed in clashes since the president was overthrown by the military on 3 July.

Meanwhile a court in Cairo said it would start the trial of Muslim Brotherhood leader Mohammed Badie and two of his deputies on 25 August.

Mr McCain and Mr Graham are expected to land in the Egyptian capital on Monday evening for two days of negotiations.

Over the weekend, US deputy secretary of state, William Burns, already held separate talks with members of Mr Morsi's Muslim Brotherhood and the Egyptian Foreign Minister, Nabil Fahmy.

The European Union's envoy, Bernardino Leon, also joined the meeting with Mr Fahmy.

Few official details have been given, but the hope is clearly to prevent further violence and bloodshed, correspondents say.