Syria has marked its deadliest month since the uprising against President Bashar al-Assad began two years ago. More than 6,000 people died in Syria during the month of March, according to the anti-government Syrian Observatory for Human Rights. Roughly a third of those killed were civilians, including about 300 children and 300 women, the group said. Nearly 1,500 government troops were also killed, along with a larger number of rebel fighters. Hundreds of civilians and rebels were not identified. In total, the group has documented more than 62,000 deaths in the conflict but says the actual toll could be about twice that. The United Nations put the death toll at roughly 70,000 in February.