More than 300 people have been killed in a week of air raids on the northern Syrian city of Aleppo and nearby towns by President Bashar al-Assad’s forces, a monitoring group said on Monday.

Many of the casualties, who included scores of women and children, were killed by so-called barrel bombs dropped from helicopters, the Syrian Observatory for Human Rights said.

Syrian authorities say they are battling rebels who have controlled parts of Aleppo, Syria’s biggest city, and most of the surrounding countryside for the past 18 months. […]