CIUDAD VICTORIA, Mexico—Mexican authorities say they have found 19 shot and burned bodies near a town across the Rio Grande from Texas in an area that has seen violent territorial disputes between organized crime groups in recent years. The Tamaulipas state prosecutor’s office said late Saturday that the bodies were discovered along a dirt road outside Camargo after residents reported a burning vehicle. Authorities found two vehicles on fire, one containing four bodies and the other 15. Some rifles were also found. All had been shot, but shells were not found at the site, leading investigators to believe they were killed somewhere else. A Camargo official, who requested anonymity due to security concerns, said the killings occurred Friday, but people had been afraid to report them. Meanwhile, in Guatemala, rumors swirled Sunday that Guatemalan migrants were among the dead. The Foreign Affairs Ministry said in a statement that Guatemala’s embassy …