Anti-government protests spread across Syria - fueled even more by the death of the longest-serving leader in the Arab world - Muammar Gaddafi.<br/> Amateur video that could not be independently verified by Reuters - showed demonstrators - celebrating Gaddafi's death and calling for Syrian President Bashar al-Assad to go.<br/> Taking to the streets Thursday night - and after Friday prayers, protesters said security was increased.<br/> At least 13 protesters were killed by security forces.<br/> Most of the protesters were killed in the central city of Homs and in Hama in the north - both hotbeds for anti-Bashar activism.<br/> Assad has faced seven months of popular protests against his rule.<br/> Sarah Irwin, Reuters.