Although rooftop sentries were immediately suspicious of the truck — parked some 80 feet from the building — and attempted an evacuation , few escaped . Comparable to 20,000 pounds of TNT , the bomb was estimated to be larger than the one that destroyed the federal building in Oklahoma City a year before , and more than twice as powerful as the 1983 bomb used at the Marine barracks in Beirut
Marine barracks in Beirut
1983 Beirut barracks bombings
Ahmed Ibrahim Al-Mughassil