The Pentagon has said it is investigating what could be its deadliest strike on civilians in Syria since its anti-IS campaign began two years ago. Syrian opposition groups and monitors said a strike on 19 July is likely to have killed over 100 civilians, including whole families in Syria’s Aleppo province. Speaking from Baghdad, Colonel Christopher Garver said that the anti-IS coalition reviewed reports of US warplanes killing civilians and has completed a preliminary probe. The result was that the information available was credible enough to warrant a formal investigation, which has now been initiated. Meanwhile the Syrian Observatory for Human Rights continues to monitor and report on civilian casualties as airstrikes continue. Researchers and reporters based in the Middle East have catalogued 74 civilians killed last week, but how many more may have died in US and allied airstrikes remains unclear.