Over 7,700 Yemenis were killed over the course of 2014 due to armed clashes, according to a study published by a Yemeni NGO late Saturday. The study conducted by Abaad Studies and Research Center noted that the 2014 figures represent a threefold increase from the toll of 2011, when a popular uprising broke out against the country's former president Ali Abdullah Saleh. Sources for the figures cited in the study were not revealed. According to the study, the Yemeni military lost more than 1,000 troops during 2014, of which at least 600 were killed by members of the Shiite Houthi militant group.