Egyptian protesters attack the Muslim Brotherhood headquarters in the Muqattam district in Cairo, Sunday, June 30, 2013. Massive crowds thronged the streets of Cairo and cities around the country Sunday and marched on the presidential palace in a cheering tide of people that filled a broad avenue for blocks in an attempt to force out the Islamist president with some of the most gigantic protests Egypt has seen in 2 ½ years of turmoil. After dark, youths attacked the headquarters of Morsi's Musli