Assad's forces attack rebels by nerve sarin near Damascus, kill 4

Field sources have confirmed that the nerve agent sarin was used by Bashar al-Assad's forces in an attack on Islam Army in Adra city near Damascus on Sunday, leaving four rebels dead and twenty infected.

The victims' symptoms were similar to the Aug. 21 2013 chemical attack, described by medics, including shortness of breath, disorientation, runny nose, eye irritation, blurred vision, nausea, vomiting, general weakness, and eventual loss of consciousness. 

The attack last summer that killed more than 1,400 people was the world's worst human rights violation of 2013, the U.S. administration said last week.