The fate of Hosni Mubarak must be decided in a "transparent and impartial" way, William Hague said amid fears the former Egyptian president's release from jail could further inflame unrest.
The comments came amid concern the decision of an Egyptian court to order the release on bail of Mubarak - detained since he was ousted by a pro-democracy rising in 2011 - could worsen tensions.
"This is a matter for the Egyptian judicial system but we hope that all the decisions they take, particularly on such a sensitive matter, will be transparent and will be impartial," Mr Hague said.
European Union foreign policy chief, Baroness Ashton, has said the EU governments have agreed to review the assistance given to Egypt, in light of the recent bloodshed in the country.
She added that the most vulnerable would continue to receive help. Her comments follow an emergency meeting of the EU Foreign Affairs Council.
Speaking after an emergency meeting of the EU Foreign Affairs Council, Foreign Secretary William Hague condemned the on-going bloodshed in Egypt and praised the work of European Union foreign policy chief Cathy Ashton.
He said: "All ministers have been reflecting the strong condemnation of the disproportionate actions of the Egyptian security forces but also of the acts of some of those opposed to the authorities in the attacking of churches and hospitals - totally unacceptable acts of terrorism."
Egypt's general prosecutor has said he will not appeal a Cairo court's decision to release the deposed leader Hosni Mubarak, paving the way for his release, NBC News reports.
Hosni Mubarak's lawyer has said that the former president could be freed as early as tomorrow.
An Egyptian court has ordered the release of the deposed president Hosni Mubarak, a security source has told Reuters.
An Egyptian court will review a petition for the release of deposed President Hosni Mubarak later today, judicial sources have told Reuters.
His lawyer told ITV News that all charges had been dropped and that Mr Mubarak could walk free in the next few days, if the court upholds the petition.
The longstanding leader has been in custody since his overthrow in 2011 charged with various counts of corruption and ordering the killing of protesters.
Reuters reports that he still faces the prospect of a retrial for the latter accusation.
An Egyptian court will tomorrow review a petition for the release of deposed president Hosni Mubarak filed by his lawyer, judicial sources told Reuters.
The court will convene at the Cairo prison where Mubarak is being held.
If the court upholds the petition, Mubarak will be released as there remains no further legal grounds for his detention, though he is being retried on charges of ordering the killing of protesters during the 2011 uprising, the sources added.
Egypt's former president Hosni Mubarak could walk free within days his lawyer confirmed today as the sense of crisis in the country deepens.Read the full story ›
Egypt's former leader Hosni Mubarak is likely to walk free within a week having faced the prospect of execution just weeks ago.
Mr Mubarak's lawyer confirmed to ITV News that all charges had been dropped, although he refused to appear on camera.
The news emerged as it was announced that the country's first democratically-elected but now deposed president, Mohamed Morsi, could face new charges.
ITV News International Correspondent John Irvine reports from Cairo: