TUXTLA GUTIERREZ, Mexico (AP) — Mexican authorities say at least 49 people are dead and dozens more injured after a cargo truck carrying people who appeared to be Central American migrants rolled over and crashed in southern Mexico. The head of the Chiapas state civil defense office says the preliminary estimate lists 49 dead and 58 injured. He says about 21 of the injured have serious wounds. It is not unusual for freight trucks in Mexico to be carrying so many people in migrant-smuggling operations. The crash occurred Thursday on a highway leading toward the Chiapas state capital. Photos from the scene show victims strewn across the pavement and inside the truck’s freight compartment.