Supporter of ousted President Mohammed Morsi shoots gun toward Egyptian police, Cairo's Nasr City district, Aug. 14, 2013.
The Egyptian government's deadly crackdown on supporters of former Islamist President Mohamed Morsi has drawn condemnation from leaders of Muslim nations who backed the ousted leader.
European powers urged the military-backed interim government and its Islamist opponents to avoid an escalation of violence and return to a political dialogue.
Turkish Prime Minister Recep Tayyip Erdogan described Wednesday's crackdown by Egyptian security forces on pro-Morsi protest camps in Cairo as a "massacre." He urged the U.N. Security Council and the Arab League to act immediately to stop it.
Turkish President Abdullah Gul accused the Egyptian government of staging an armed intervention against civilians and called that "unacceptable." Egyptian authorities said some of the protesters were armed and fired at security forces.
Ankara was one of the strongest international critics of the Egyptian military's decision to oust Morsi on July 3, one year after he took office as Egypt's first democratically elected leader.
The military said it acted in response to what it called the will of the people after mass protests by secular Egyptians who accused Morsi of being anti-democratic.
Heavy Casualties Reported in Egypt
1/16A member of the Egyptian security forces speaks to a woman holding a stick as they clear a sit-in by supporters of ousted Islamist President Mohammed Morsi, at the smaller of the two camps, near the Cairo University campus in Giza, Cairo, Egypt, August 14, 2014.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
2/16Supporters of ousted Islamist President Mohammed Morsi surround a burning police car during clashes with Egyptian security forces in Cairo's Mohandessin neighborhood, Egypt, August 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
3/16Supporters of Egypt's ousted President Mohammed Morsi chant slogans against Egyptian Defense Minister Gen. Abdel-Fattah el-Sissi during clashes with Egyptian security forces in Cairo's Mohandessin neighborhood, Egypt, August 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
4/16A police vehicle is pushed off of the 6th of October bridge by protesters close to the largest sit-in by supporters of ousted Islamist President Mohammed Morsi in the eastern Nasr City district of Cairo, Egypt, August 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
5/16A member of the Egyptian security forces holds up a copy of the Quran as clear they clear the smaller of the two sit-ins by supporters of ousted Islamist President Mohammed Morsi, near the Cairo University campus in Giza, Cairo, Egypt, August 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
6/16Supporters of Egypt's ousted President Mohammed Morsi clash with the Egyptian security forces as the forces clear their sit-in camp in the eastern Nasr City district of Cairo, Egypt, August 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
7/16Makeshift wooden huts burn at a sit-in camp set up by supporters of ousted Islamist President Mohammed Morsi as Egyptian security forces clear the camp near Cairo University in Cairo's Giza district, Egypt, August 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
8/16Supporters of ousted Islamist President Mohammed Morsi carry another as Egyptian security forces clear a sit-in camp set up near Cairo University in Cairo's Giza district, Egypt, August 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
9/16A protester comes to the aid of a wounded comrade as security forces clear a sit-in by supporters of ousted Islamist President Mohammed Morsi in the eastern Nasr City district of Cairo, Egypt, August 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
10/16Supporters of ousted Islamist President Mohammed Morsi, stand among debris and smoke in background as they confront Egyptian security forces trying to clear the smaller of the two sit-ins, near the Cairo University campus in Giza, Cairo, Egypt, Wednesday,
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
11/16Egyptian security forces clear a sit-in by supporters of ousted Islamist President Mohammed Morsi in the eastern Nasr City district of Cairo, Egypt, August 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
12/16Protesters throw stones at Egyptian security forces trying to clear a sit-in by supporters of ousted Islamist President Mohammed Morsi in the eastern Nasr City district of Cairo, Egypt, August 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
13/16Egyptian security forces detain protesters as they clear a sit-in by supporters of ousted Islamist President Mohammed Morsi in the eastern Nasr City district of Cairo, Egypt, August 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
14/16A wounded protester lies on the ground as Egyptian security forces clear the smaller of the two sit-ins by supporters of ousted Islamist President Mohammed Morsi, near the Cairo University campus in Giza, Cairo, Egypt, August 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
15/16A lightly wounded member of the Egyptian security forces talks with other officers as they clear sit-ins by supporters of ousted Islamist President Mohammed Morsi, near the Cairo University campus in Giza, Cairo, Egypt, August 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
16/16Fires burn as Egyptian security forces clear a sit-in by supporters of ousted Islamist President Mohammed Morsi in the eastern Nasr City district of Cairo, Egypt, Aug. 14, 2013.
News media in Cairo are reporting heavy casualties after Egyptian security forces moved in on two sit-in protests supporting ousted Islamist President Mohamed Morsi.
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A spokesman for U.N. Secretary-General Ban Ki-moon said the U.N. chief condemns the violence in Egypt in the strongest terms, and regrets that Egyptian authorities chose to use force against the mostly Islamist demonstrations.
However, the spokesman also said the U.N. chief also is "well aware that the vast majority of the Egyptian people [are] weary of disruptions to normal life caused by demonstrations and counter-demonstrations, and want their country to go forward peacefully in an Egyptian-led process."
Iran joined Turkey in condemning the Egyptian crackdown as a "massacre." The Fars news agency quoted the Iranian foreign ministry as warning Egypt that if it does not change course, Israel and "arrogant" world powers will derail the Egyptian people's revolution.
Iran's Islamist leadership began reaching out to regional rival Egypt after a 2011 popular uprising deposed Egypt's longtime secular ruler, President Hosni Mubarak, and paved the way for Morsi's election a year later.
Qatar, a supporter of Morsi's Muslim Brotherhood movement, denounced Egypt for using force against what it said were "peaceful protesters." In a statement, the Qatari foreign ministry called on Egyptian authorities to "preserve the lives" of the demonstrators.
In Brussels, EU spokesman Peter Stano said the reports from Cairo were "extremely worrying." He said violence will not lead to solutions, and urged all parties to "exercise maximum restraint."
British Foreign Secretary William Hague took a tougher line against the Egyptian government, saying he condemns its use of force in clearing the protests. He said leaders on all sides "must work to reduce the risk of further violence."
Some information for this report was provided by AP, AFP and Reuters.
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