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People reach for a coffin on Thursday, August 15, during a funeral for policemen killed during a crackdown at two protest camps in support of ousted President Mohamed Morsy yesterday in Cairo, Egypt. Ferocious clashes on Wednesday, August 14, reportedly left more 500 people dead across Egypt, and authorities have declared a monthlong state of emergency. The recent string of violence began when Egyptian security forces stormed two makeshift camps to clear out Morsy supporters. Look back at Egypt after the coup.

Egyptian policemen attend the funeral for their colleagues on August 15.

Men are detained near a burned section of Rabaa Al-Adawiya mosque in Cairo on August 15.

People search through debris at Rabaa al-Adawiya Square on August 15.

A man on August 15 checks out a list of names of those killed in the crackdown.

Egyptians mourn over a body wrapped in shrouds at a Cairo mosque August 15.

Morsy supporters carry a coffin into a mosque in Cairo's Nasr City on August 15.

A woman weeps after identifying the body of a relative on August 15 at a Cairo mosque.

A man walks inside the burned-out Rabaa Al-Adawiya mosque in Cairo on August 15.

Motorcyclists pass by debris, including Morsy posters, in Cairo's Nahda Square on August 15.

Supporters of Morsy shout during clashes with Egyptian police at the Rabaah Al-Adawiya protest camp in Cairo's Nasr City district on August 14.

A woman tries to stop a military bulldozer from hurting a wounded youth during clashes on August 14 in eastern Cairo.

Morsy supporters run as Egyptian security forces fire toward them on August 14.

An injured youth is seen at a makeshift hospital in Cairo on August 14.

Supporters of Morsy take cover from Egyptian security forces during clashes on August 14.

A Morsy supporter reacts after identifying the body of a dead family member at the Rabaa al-Adaweya Medical Centre on August 14 in Cairo.

The national identity cards of protesters allegedly killed during a clear-out operation by Egyptian security forces on pro-Morsy demonstrators are exchanged at the Rabaa al-Adaweya Medical Centre on August 14.

A Morsy supporter lies wounded on a stretcher at the Rabaa al-Adaweya Medical Centre on August 14.

Plumes of smoke rise from the site of a protest in support of deposed President Morsy in Cairo on August 14.

Army bulldozers remove a barricade erected by supporters of Morsy during clashes with riot police at Cairo's Mustafa Mahmoud Square on August 14.

Supporters of Morsy push a police vehicle off the 6th of October Bridge in Cairo on August 14.

A member of the Egyptian security forces lies on the ground in Cairo on August 14 after a police vehicle was pushed off the 6th of October Bridge.

A man grieves at a makeshift morgue in Cairo on August 14.

Morsy supporters confront police at Cairo's Mustafa Mahmoud Square on August 14.

Morsy supporters carry a wounded man during clashes with riot police in Cairo on August 14.

A Morsy supporter during clashes with police in Cairo on August 14.

Riot police stand behind a wounded man near Rabaa al-Adawiya mosque in Cairo on August 14.

Supporters of Morsy and members of the Muslim Brotherhood run from tear gas as security forces move in at the site of a pro-Morsy sit-in in Cairo on August 14.

A Morsy supporter sits under arrest at Cairo's Nahda Square on August 14.

Egyptians help a woman suffering from tear gas exposure in a street leading to Rabaa al-Adawiya mosque in Cairo on August 14.

Egyptian security forces detain protesters in Cairo's Nasr City district on August 14.

The scene from a street in Cairo's Nasr City appears chaotic as security forces clear a sit-in August 14.

A woman tries to protect herself from tear gas in Cairo on August 14.

Muslim Brotherhood supporters run from tear gas in a street leading to Rabaa al-Adawiya mosque in Cairo on August 14.

Protesters gather in Cairo's Rabaa al-Adawiya Square on Monday, August 12.

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Cairo (CNN) -- As Egypt faces the gruesome aftermath of clashes that left hundreds dead, demonstrators plan to defy an emergency order and take to the streets to mark "Friday of anger."

The Muslim Brotherhood promised huge protests and Egypt's military government showed no sign of easing its crackdown, setting the stage for what could become another catastrophic encounter of security forces and protesters.

The Egyptian army blocked all entrances and exits of Cairo's Tahrir Square with armored vehicles and barbed wire in anticipation of new protests, state-run EGYNews reported.

At least 20 police officers were wounded when assailants opened fire on two security cars north of Cairo, according to EGYNews.

The leaders of France, Germany and the UK will have phone conversations to discuss Egypt, the office of French President Francois Hollande said.

Hollande planned to talk to German Chancellor Angela Merkel and British Prime Minister David Cameron.

Egyptian authorities on Thursday rejected criticism from U.S. President Barack Obama and other world leaders for ferocious clashes the day before, which left at least 580 people dead when security forces broke up huge sit-ins in Cairo, according to the health ministry.

More than 4,000 were injured. Casualties included civilians, police officers and bystanders.

Egypt braces for the "Day of Anger"

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Egypt's churches looted and torched

Condemnation of Egypt protest response

Egypt mosque becomes morgue

The protesters support former President Mohamed Morsy, a former Muslim Brotherhood leader elected president in 2012 but removed by the military July 3. Morsy and some other Brotherhood leaders are under arrest.

On Thursday, state media said Morsy supporters were attacking police stations, hospitals and government buildings outside Cairo. The Interior Ministry said police would use live ammunition against any further attacks.

There also were dozens of reports of attacks, blamed on Morsy supporters, on churches and other Christian facilities across the country .

The "Friday of Anger" will begin with marches from mosques around Cairo, which will converge in central Ramses Square, according to tweets from Gehad El-Haddad, a Muslim Brotherhood spokesman.

The Muslim Brotherhood's senior leader still at large, Essam Elerian, said Thursday the protests will continue until Morsy is returned to office.

"They can arrest me and 100 of us, but they can't arrest every honorable citizen in Egypt," Elerian told CNN. "They can't stop this glorious revolution."

Obama cancels joint military exercises

Obama on Thursday announced he had canceled joint U.S.-Egyptian military exercises, which had been scheduled for September.

"Our traditional cooperation cannot continue as usual when civilians are being killed in the streets and rights are being rolled back," the president said.

He called on the government to lift a state of emergency decree limiting public gatherings. Addressing the government's opponents, Obama added, "We call on those who are protesting to do so peacefully and condemn the attacks that we've seen by protesters, including on churches."

Churches, schools reported attacked

Dalia Ziada of the Ibn Khadun Center for Development Studies said Thursday that her group had documented the burning of 29 churches and Coptic facilities across the country.

The Bible Society of Egypt said 15 churches and three Christian schools had been attacked, some set on fire.

State-run Nile TV reported Morsy supporters attacked a church Thursday in Fayoum, southwest of Cairo.

At least 84 people, including Muslim Brotherhood members, have been referred to military prosecutors for charges including murder and the burning of churches, the state-run EGYNews site reported.

Echoes of violence

The violence echoed the upheaval that preceded the fall of Hosni Mubarak from the presidency in 2011. The military removed Mubarak after protests against his authoritarian rule, but not before an estimated 840 people were killed.

The generals yielded power to Morsy after elections, but the new president soon was accused of pursuing an Islamist agenda and excluding other factions from the government. Morsy's supporters say the deposed president wasn't given a fair chance and that the military has returned to its authoritarian practices of the Mubarak era.

The government reinforced the comparison by imposing the monthlong state of emergency, a favored tactic of Mubarak.

Obama warns 'further steps' could be taken

Obama, who has resisted calls to cut off military aid to Egypt and label Morsy's ouster a coup, on Thursday stressed the United States would not support one political faction over another.

"We appreciate the complexity of the situation," the president said. "While Mohamed Morsy was elected President in a democratic election, his government was not inclusive and did not respect the views of all Egyptians. We know that many Egyptians, millions of Egyptians, perhaps even a majority of Egyptians, were calling for a change in course. "

But he said he may take unspecified "further steps" because of the government's crackdown.

U.N. High Commissioner for Human Rights Navi Pillay asked for an investigation into the violence.

"The number of people killed or injured, even according to the government's figures, point to an excessive, even extreme, use of force against demonstrators," she said.

Germany, France and other nations summoned Egypt's ambassadors to their nations to express dismay over the violence, with Italy typical among them in criticizing the "force used by police (as) brutal, disproportionate and ... not justifiable."

Denmark suspended economic aid to the country.

Even predominantly Muslim nations voiced displeasure, with Turkey recalling its ambassador in Egypt to return to Ankara in light of the crisis, a Turkish foreign ministry spokesperson said.

CNN's Reza Sayah reported from Cairo; David Simpson wrote from Atlanta. CNN's Hamdi Alkhshali, Saskya Vandoorne, Mohammed Tawfeeq, Ian Lee, Frederik Pleitgen, Laura Smith-Spark, Greg Botelho, Michael Pearson and Holly Yan also contributed to this report.