The third victim , who is from El Salvador , is now in the United States . Salvadoran president said his testimony could help authorities crack the case . The growing reach of drug cartels has increased the risk for migrants crossing through Mexico to get to the United States , Mexico 's National Commission for Human Rights said . Police are still searching the homes of the 72 migrants involved .
The third victim , who is from El Salvador , is now in the United States . Salvadoran president said his testimony could help authorities crack the case . Police are still searching the homes of the 72 migrants involved .