Long lines of holiday travelers pushing heavily laden baggage carts were waiting in the main departure lounge of Rome's Leonardo da Vinci Airport. Hardly anyone paid much attention to four dark-complexioned young men who mingled with the crowd. One wore an expensive gray suit and camel's hair topcoat. Two were in blue jeans and jackets, and had pulled scarves partly over their faces. The fourth sported a green beret. They were not traveling light: they carried 13 hand grenades and four AK-47 automatic rifles.
At 9:03 a.m., one of the men threw a grenade toward a nearby espresso bar and hamburger...