After seven devastating years of civil war in Syria, which have left more than 350,000 people dead, President Bashar al-Assad appears close to victory against the forces trying to overthrow him.

So how has Mr Assad got so close to winning this bloody, brutal war?

A joint investigation by BBC Panorama and BBC Arabic shows for the first time the extent to which chemical weapons have been crucial to his war-winning strategy.

View a map of the 106 chemical attacks that have taken place since 2014 and learn more about the use of chemical weapons by the Assad regime in BBC’s article.