Egypt braced for more violence on Friday as the Muslim Brotherhood called for a day of rage and the death toll from Wednesday's police assault passed 600, dpa reported.
"AntiCoup rallies tomorrow will depart from all mosques of Cairo & head towards Ramisis square after Jumaa prayer in 'Friday of Anger'," Brotherhood spokesman Gehad El-Haddad tweeted on Twitter.
Earlier Thursday, more than 200 bodies awaited burial on the floor of Iman Mosque in Nasr City, designated by protestors as a mortuary. Late in the day, Egyptian security forces took over and oversaw the transport of shrouded bodies in ambulances.
The escalating violence deepened the political crisis sparked by the military's ouster last month of popularly elected Islamist president Mohammed Morsi. Police were authorized to use deadly force against demonstrators who attack government buildings, the Interior Ministry said.
International isolation grew for the Arab world's most populous nation of 85 million people.
The United States urged its citizens to leave Egypt. Scandinavian travel firms aimed to evacuate all of their travellers by Monday after the governments of Denmark, Sweden and Norway warned against unnecessary travel.
Turkey recalled its ambassador for consultations, and Egypt also recalled its ambassador from Ankara.
The United Nations Security Council condemned the violence and called on all parties to stop acts of aggression, the president of the council said after an emergency meeting.
"The view of the council members is that it is important to end violence in Egypt, that the parties exercise maximum restraint," Maria Cristina Perceval, Argentina's representative and current council president, said.
France, Britain, Germany and Italy summoned Egyptian envoys to protest the crackdown on Islamist protesters. The European Union foreign ministers are to confer next week.
US President Barack Obama cancelled joint military exercises but did not mention the status of 1.5 billion dollars in aid that goes primarily to the Egyptian military. Republican members of the US Congress want to cut the aid.
"While we want to sustain our relationship with Egypt, our traditional cooperation cannot continue as usual when civilians are being killed in the streets and rights are being rolled back," Obama said.
The Egyptian presidency hit back early Friday, saying that it valued his concern but feared that his comments would "strengthen violent armed groups" and "encourage" them "in their opposition to stability and democratic transformation."
"Egypt is facing terrorist acts targetting government buildings and vital installations," said the office of interim President Adly Mansour.
Brotherhood supporters, angered by the bloody assault on two of its protest camps a day earlier, stormed and set fire to government offices in Giza, Cairo's twin city.
Other protesters attacked police stations and Coptic Christian churches across Egypt.
The Brotherhood, from which Morsi hails, had earlier vowed to bring down the "military coup" through peaceful means, undeterred by a dusk-to-dawn curfew imposed by the army-appointed government in Cairo and 13 other governorates.
Police on Wednesday used tear gas, bulldozers and live bullets to clear protesters from the sprawling encampments of Morsi supporters.
According to the Egyptian Health Ministry, the death toll a day after police broke up the protest camps had reached 638, according to media reports. The number of injured stood at 4,201.
The ministry, quoted by state-run newspaper Al-Ahram, said that 228 of the dead were killed when the police stormed the main Muslim Brotherhood protest site at Rabaa al-Adawiya in north-eastern Cairo. Another 90 died at the smaller camp outside Cairo University.
A dpa witness on Thursday counted at least 230 bodies in blood-stained white burial shrouds in the Iman Mosque in Nasr City, near Rabaa al-Adawiya.
Ice blocks on some of the corpses were used to hold off decay, and new consignments of coffins, electric fans and more ice were constantly arriving. Grieving women sat by others, awaiting the arrival of medical examiners to release burial certificates.
Men sprayed air freshener around to mask the smell of death and doused the floor with disinfectant.
A funeral was held for some of the victims after afternoon prayers, before their families took them for burial.
Outside, people searched for their relatives' names in the lists that covered 19 posters hanging on the mosque's boundary fence.
"This is a war against Islam," said Diya Ragab as he stood on the footpath holding burnt remains of a Koran copy he said he had rescued after the Rabaa al-Adawiya mosque was set on fire.
In volatile Sinai, eight soldiers were killed and six injured in coordinated attacks on two security checkpoint, said security sources. The attacks, believed to be mounted by Islamist insurgents, were the latest in the vast desert peninsula since Morsi's toppling on July 3.
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