Why did the ceasefire fail in Syria and what about IS group detainees?

A day after a sweeping deal was announced between the Syrian government and the country's main Kurdish-led force, the agreement appeared to be falling apart Monday. After new outbreaks of clashes Monday, the Kurdish-led Syrian Democratic Forces issued a statement calling for “all of our youth” to “join the ranks of the resistance”. FRANCE 24's Wassim Nasr brings you this analysis.