DALLAS (AP) — An FBI official says a rented moving truck parked at a curb at the Dallas-Fort Worth airport caused a brief scare on the 10th anniversary of the Sept. 11 terrorist attacks.FBI official Kevin Gentry says the truck was driven by a crew member of the Discovery Channel show "Sons of Guns." Investigators were suspicious because the driver said, "I got a couple of guns," but Gentry says he was just waiting for a co-worker. The two will film in El Paso and Albuquerque, N.M.Airport spokesman David Magana says a bomb squad and canine units were deployed when an automatic weapon was found in the truck, parked in an area where troops returning from Middle East stints are greeted.A Discovery Channel spokesman was not immediately available to comment.