The head of al-Qaeda, Ayman al-Zawahiri has reportedly issued an audio message in which he accuses the United States of plotting the overthrow of Egypt's first Islamist president Mohamed Morsi.
CNN reported the 14-minute message, the apparent first to address Mr Morsi's ousting last month, was posted to Jihadist forums yesterday.
Al-Zawahiri is quoted as saying: "The crusaders, the seculars, the Americanised army, (former President Hosni) Mubarak's thugs and some members of Islamic parties with the support of Gulf money and American plotting, all agreed to topple Mohamed Morsi's government."
In a phone call with Egyptian vice president for foreign affairs, Mr Hague stressed the need for dialogue and reconciliation between all political parties including Mr Morsi's Muslim Brotherhood.
The Foreign Secretary also condemned the excessive use of force by security services as well as attacks against them.
Mr Hague said: "We want to see a peaceful resolution that will bring an urgent end to the current bloodshed. In my view, this should involve a process of dialogue and reconciliation between all political parties in Egypt, including the Muslim Brotherhood.
"I also called for the release of all political detainees, including President Morsi, unless there are criminal charges to be made against them, and emphasised that it is vital that any charges are not politically motivated."
Supporters of Egypt's ousted president Mohammed Morsi marched towards security headquarters in Cairo on Monday night, raising fears of new clashes as the EU's foreign policy chief met local officials, according to the Agence France Presse agency.
The marches came despite a warning from the National Defence Council late Sunday that it would take "decisive and firm action" against demonstrators if they went beyond their right to peaceful protest.