CAIRO (Update 7) - Demonstrators burned cars and barricaded themselves with barbed wire in Cairo's central Tahrir Square, demanding the resignation of the military's chief Saturday hours after troops violently dispersed a protest there, killing at least one and injuring 71. In the pre-dawn raid on the square, hundreds of soldiers beat protesters with clubs and fired into the air in the square, highlighting the rising tensions between protesters and the military leaders whom they praised in Tahrir two months ago when President Hosni Mubarak fell from power. Several thousand protesters, some armed with sticks and other makeshift weapons, had moved back into the square by Saturday afternoon. They vowed not to leave until the defence minister, Field Marshal Mohammed Hussein Tantawi, resigns. Tantawi, a Mubarak appointee, leads the Supreme Council of the Armed Forces, which rules Egypt now and is made up of the military's top generals.
