CAIRO: Demonstrators gathered in Cairo's Tahrir Square said thugs are gathering at the entrances to the square and want to burn all the tents pitched in the square, where demonstrators have been camping out. A state of panic caught the demonstrators and around 4,000 protesters left the square when one of the vendors exploded a gas tube. Some of demonstrators distinguished the fire. Four people fainted from exposure to the fumes and were treated in one of the ambulances in the square.