At least 70 people have died in a suspected chemical attack in the suburb of Douma, the last rebel-held town in Syria’s Eastern Ghouta.

The attack after nightfall on Saturday sent a stream of patients with burning eyes and breathing problems to clinics, medical and rescue groups said.

Western governments were quick to condemn the attack, with the British Foreign Office calling for a much-needed investigation and saying that if the use of chemical weapons proved to be true, it is further proof of the brutality of Bashar al-Assad’s government.