FALLUJAH, Iraq (AP) -- U.S. Army units moved in force early Sunday to seal off the conservative town of Fallujah, west of Baghdad, intending to raid the homes of suspected militia leaders and search for illegal weapons. Soldiers from the 3rd Infantry Division's 2nd Brigade targeted locations where intelligence reports indicated militia operations were underway or weapons stockpiled for use against U.S. forces. The operation was called "Spartan Scorpion." The initial thrust against the city 37 miles from the capital met no resistance, but Iraqis flashed their porch lights in apparent warning to each other that American troops were coming....