Protesters stormed and ransacked the Cairo headquarters of President Mohammed Morsi's Muslim Brotherhood group early Monday, in an attack that could spark more violence as demonstrators gear up for a second day of mass rallies aimed at forcing the Islamist leader from power.
Organizers of the protests, meanwhile, gave Morsi until 5 p.m. on Tuesday to step down and called on the police and the military to clearly state their support for what the protest movement called the popular will.
Sunday saw millions of Egyptians flood the streets nationwide in a massive outpouring of anger and frustration with the president and the Brotherhood, the Islamist group that propelled Morsi to power. The protests were largely peaceful, although in a sign of the volatility of the country's divisions, clashes erupted in the evening around the Brotherhood's Cairo headquarters between armed Morsi supporters barricaded inside the building and young protesters pelting it with firebombs and rocks.
After clashes raged overnight, protesters managed to breach the compound's defenses and storm the six-story building early Monday, carting off furniture, files, rugs, blankets, air conditioning units and portraits of Morsi, according to an Associated Press journalist at the scene. One protester emerged with a pistol and handed it over to a policeman outside.
Footage on local TV networks showed smashed windows, blackened walls and smoke billowing out of the fortified villa in the Muqatam district in eastern Cairo. A fire was still raging on one floor hours after the building was stormed. One protester tore down the Muslim Brotherhood sign from the building's front wall, while another hoisted Egypt's red, black and white flag out an upper-story window and waved it in the air in triumph.
Health Ministry spokesman Yehya Moussa told state television that at least 16 people nationwide have been killed in violence related to the protests since Sunday, eight of them at the Brotherhood's headquarters. A total of 781 people have been injured, he added.
It was not immediately clear whether the Brotherhood supporters holed up inside who had been battling the protesters late Sunday fled the building overnight.
Morsi's critics view the Brotherhood headquarters as the seat of real power in Egypt, consistently claiming that the Islamist group's spiritual leader, Mohammed Badie and his powerful deputy, Khairat el-Shater, were the ones actually calling the shots in the country, not the president.
The Brotherhood has in recent weeks fortified the building's walls in anticipation of the massive opposition protests in which millions took part on Sunday in a display of anger and frustration with the Islamist leader on the anniversary of his inauguration.
On Monday, anti-Morsi protesters were gearing up for a second day of demonstrations.
Some protesters spent the night in dozens of tents pitched in the capital's central Tahrir Square and in front of the president's Ittihadiya Palace. They have vowed to stay there until Morsi resigns. The president's supporters, meanwhile, continued their sit-in in front of a major mosque in another part of Cairo.