(ROUGH CUT ONLY - NO REPORTER NARRATION)<br/> Clouds of tear gas fill the air on Mohamed Mahmoud Street in central Cairo, during the fifth day of clashes between pro-democracy protesters and security forces.<br/> Police fire tear gas canisters from behind makeshift barricades, and demonstrators hurl them back.<br/> Protesters also said that security forces were deliberately setting homes on fire in an effort to increase perceptions of chaos.
