Troop deployment creates tense atmosphere on US border

Pedestrians pass members of the U.S. military working to place razor wire along the U.S.-Mexico border Friday on the McAllen-Hidalgo International Bridge in McAllen, Texas. (AP Photo/Eric Gay)

BROWNSVILLE, Texas — As the first active-duty military troops sent to the U.S. border with Mexico installed coils of razor wire on a bridge and a riverbank Friday, a sense of unease spread across Texas’ Rio Grande Valley.