U.S. troops reinforced positions around Falluja after an overnight air strike on Tuesday and sealed main roads out of the rebel-held city. Witnesses said U.S. tanks and armored vehicles cut off the main highway to Jordan that runs just north of Falluja, as warplanes criss-crossed the skies. Troops took up positions in empty buildings on the Sunni Muslim city’s southern perimeter. A civilian driver was shot dead near a U.S. checkpoint on the highway, witnesses said. The military said it was checking the report. Only one road leading northwest out of the city, which lies 32 miles west of Baghdad, remained open to civilian traffic, the witnesses said. Full Story