Violence in Cairo, Egypt dramatically escalated on Feb. 2 as pro- and anti-Mubarak mobs clashed in Tahrir (Liberation) Square. Shots were fired and hundreds of injuries have been reported. Some protesters told ABC News' Christiane Amanpour that President Hosni Mubarak's announcement Tuesday night that he will not seek reelection is not enough and he needs to be gone now. Others fear that Egypt's economy and government will collapse if he's removed. (ABC News/Katie Hinman)