SAN'A, Yemen -- Security forces opened fire on a massive anti-government demonstration in the capital Wednesday, killing 12 protesters and wounding some 190, a doctor. The violence broke out as 100,000 filled a landmark square at the epicenter of the uprising. The security forces, including members of the elite Republican Guard, were seen firing live ammunition and tear gas into the crowd. Yemenis in at least 18 cities and towns launched a civil disobedience campaign against President Ali Abdullah Saleh. -- AP

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