It was rush hour on a Sunday, the first day of Syria's working week, when the bomb landed in the middle of the bustling crowd in the rebel-held city of Douma. A second bomb followed, allegedly dropped once people had had time to gather to assess the damage from the first. At least 80 people were killed and hundreds more injured.

These airstrikes by government warplanes graphically illustrate why President Bashar al-Assad's regime remains, for many Syrian civilians at least, the biggest threat to their lives.

While the United States may be focussing its bombing campaign against the so-called Islamic State, the Islamist militants are actually only responsible for a fraction of the civilian deaths in Syria.