Belgian authorities have prevented several attacks by jihadist fighters returning home from Syria and by sympathisers with the Islamic State extremist group, .\rbr\rbr Belgian Charlie Hebdo Attack Thwarted More Counterterrorism Raids Underway..NSA Justified (Redsilverj) More .\rbr\rbrCNN has obtained exclusive video from inside a Paris-bound train where two U.S. military members and a civilian foiled a terror plot.\rbr\rbrBelgium raids thwart plan to kill Policemen in the streets of Paris, France also .