A suspected chlorine gas attack on an opposition-held neighbourhood in the Syrian city of Aleppo caused dozens of cases of suffocation on Tuesday, rescue workers and a monitoring group said.

Syria: Aleppo hospital confirms dozens treated for breathing difficulties with clothes smelling of chlorine

A suspected chlorine gas attack on an opposition-held neighbourhood in the Syrian city of Aleppo caused dozens of cases of suffocation on Tuesday, rescue workers and a monitoring group said.