( CNN ) -- Mexican authorities say they 've rescued 94 migrants who were crammed into the back of a hauling truck in `` subhuman conditions . '' They came from as far away as Nepal and as nearby as Guatemala , paying thousands of dollars to get to the United States , authorities said . Seven of them were minors . They showed symptoms of asphyxiation and serious lesions on their hands and feet when they were rescued , Mexico 's National Migration Institute said . X-ray equipment detected the migrants at a checkpoint in the southern Mexican state of Chiapas early Tuesday morning . The driver of the truck has been turned over to prosecutors on suspicion of human trafficking , and the migrants are receiving medical , psychological and legal assistance , Chiapas state prosecutors said in a statement . Photos released by local police show migrants sitting on the ground as an official toting a stethoscope tends to them . It was not immediately clear where the migrants would go . The group included 45 Guatemalans , 23 Salvadorans , 10 Nepalese and 9 Bangladeshis and 7 Hondurans , authorities said . `` The migrants had paid different amounts for the transport , according to their nationality , '' the migration institute said . `` In the case of the Central Americas , the tariff was between $ 4,000 and $ 5,000 , and the Asians from $ 6,000 to $ 8,000 . '' Last week , Mexican authorities rescued 81 migrants they said were held captive in the border city of Reynosa . And in June , authorities said they rescued 165 migrants who were kidnapped as they tried to cross into the United States . Experts say many migrants passing through Mexico on their way to the United States are victims of violence along the Mexico-U.S. border , but the journey is perilous from the moment it begins . And the danger has grown as Mexico 's drug gangs expand their reach . In Mexico , Central American immigrants under fire . CNN en EspaÃ±ol 's Eduardo Aragon contributed to this report .
The migrants came from as far away as Nepal and as nearby as Mexico . Mexican authorities say X - ray doctors detected the migrants hidden in a cave . They showed symptoms of asphyxiation , authorities say . The migrants had paid thousands of dollars to come to the United States .