August was the deadliest month since the Syrian rebellion began a year-and a-half ago — and more deadly for civilians than the bloodiest months in the Iraq and Afghanistan wars, as well as the recent uprisings in Tunisia, Egypt, Libya, Yemen and Bahrain.

The group puts the total number of both civilian and military deaths since the uprising began at 26,000, which suggests that about 20 percent of recorded deaths occurred in August alone, when the regime began unleashing more air power to crush the revolt and fighting reached the country’s largest city and its commercial capital, Aleppo.