At least 13 people were killed and about a dozen others were taken to hospitals after a gravel truck slammed into an overloaded SUV just north of the U.S.-Mexico border, authorities said. The crash occurred about 6:15 a.m. PT at State Route 115 and Norrish Road in Imperial County, about 15 miles from the border, the highway patrol said. The semitruck full of gravel hit a maroon Ford Expedition filled with 25 passengers, the highway patrol said. The dead included some Mexican citizens ages 20 to 55, authorities said; the injured were 16 to 55.