A boy is treated for breathing difficulties
Media playback is unsupported on your device
Video

Footage shows Aleppo 'chlorine gas attack' aftermath

In Syria, rescue workers in the rebel-held part of Aleppo say that government forces have used chlorine gas to attack civilians.

They say helicopters dropped barrel bombs containing the chemical on the Sukari neighbourhood.

President Assad's government has always denied using chemical weapons.

Jeremy Bowen reports from Syria.

Go to next video: Aleppo doctor: 'My car was targeted'