Is it all about the war in Syria, really?

"The war in Syria has been a fruitful recruiting tool and training ground for extremist Sunni militants in Lebanon, who have a longstanding presence but had been seen as fairly marginal before the Syrian conflict. Until recently, they had been mainly confined to pockets in Palestinian refugee camps outside the control of Lebanese authorities."  The Nahr Al-Barid happened before the war in Syria, Ms. Barnard.