From his rooftop in the Syrian city of Raqa, Youssef Nasser watches nervously as hundreds of heavily armed Kurdish-led fighters sweep the streets of what was once the de facto capital of the Islamic State group. The 67-year-old man says he dreams of "stability and security", after IS militants attacked a security complex belonging to the US-backed Kurdish Syrian Democratic Forces in an attempt to break hundreds of fellow jihadists free from a prison there. IMAGES AND SOUNDBITES