Forty-six people have been found dead after being dumped in a tractor-trailer on a remote back road in San Antonio. Sixteen people were hospitalized, including four children, AP reported.

A city worker heard a cry for help from a truck. According to police chief William McManus, the officers who arrived found the gruesome scene.

San Antonio Mayor Ron Nirenberg said the 46 who died had families who were probably trying to find a better life.

This is nothing short of a terrible human tragedy, Nirenberg said.