CAIRO (AP) -- Weeping relatives in search of loved ones uncovered the faces of the bloodied, unclaimed dead in a Cairo mosque near the smoldering epicenter of support for ousted President Mohammed Morsi, as the death toll soared past 600 Thursday from Egypt's deadliest day since the Arab Spring began.
World condemnation widened for the bloody crackdown Wednesday on Morsi's mostly Islamist supporters, including an angry response from President Barack Obama, who canceled joint U.S.-Egyptian military maneuvers.
Violence spread Thursday, with government buildings set afire near the Pyramids, policemen gunned down and scores of Christian churches attacked. As turmoil engulfed the country, the Interior Ministry authorized the use of deadly force against protesters targeting police and state institutions.
The Muslim Brotherhood, trying to regroup after the assault on their encampments and the arrest of many of their leaders, called for a mass rally on Friday in a challenge to the government's declaration of a monthlong nationwide state of emergency and a dusk-to-dawn curfew.
At least 638 people were confirmed killed and nearly 4,000 wounded in the violence sparked when riot police backed by armored vehicles and bulldozers smashed the two sit-ins in Cairo where Morsi's mainly Islamist supporters had been camped out for six weeks calling for his reinstatement. It was the deadliest day by far since the 2011 popular uprising that toppled autocratic ruler Hosni Mubarak and plunged the country into more than two years of instability.
The Health Ministry said in a statement that 288 of those killed were in the largest protest camp in Cairo's Nasr City district, while 90 others were slain in a smaller encampment at al-Nahda Square, near Cairo University. Others died in clashes that broke out between Morsi's supporters and security forces elsewhere in the Egyptian capital and other cities.
Mohammed Fathallah, the ministry spokesman, said earlier that the blood-soaked bodies lined up in the El Imam mosque in Nasr City were not included in the official death toll. It was not immediately clear if the new figures included the ones at the mosque.
Inside the mosque-turned-morgue, the names of the dead were scribbled on white sheets covering the bodies, many of them charred, and a list with 265 names was plastered on the wall. Heat made the stench from the corpses almost unbearable as the ice brought in to chill the bodies melted and household fans offered little relief.
Over the mosque speakers, announcements urged people to leave because their body heat was making the humid conditions worse inside the mosque, where posters of Morsi were piled up in a corner.