On March 19, 2013, both the Syrian Government and the rebel opposition mutually accused of having carried out an attack against the population using some kind of chemical compound near the city of Aleppo. Resulted in 25 deaths and many injured. The compound used according to Syrian sources could be chlorine. This fact has made a point of escalation in the conflict that has led to the Syrian Government to ask for U.N. help to clarify the nature of the attack. The type of chemicals used pointed that Syriai s acting to limit and that the red line is not clearly defined