CHICAGO  - A packed pickup truck swerved off a road and smashed into two trees in Texas, killing at least 13 people and injuring 10 others late Sunday, US media reports said. The dead were found both inside and around the truck at the crash site, located off a highway near Berclair in southern Goliad County, according to the San Antonio Express-News. “It’s been very chaotic here, and it’s very traumatic,” the newspaper quoted Gerald Bryant of the Texas Department of Public Safety as saying. He added that the truck’s passengers - 23 in total - included children. At least 11 people were air-lifted to several hospitals, ABC News affiliate KZTV reported. It was unclear what caused the accident. Authorities were not immediately available for comment.