Mexican border

Police found two burnt-out vehicles on Saturday and initial findings indicate the people were shot and then set alight.

Violent drug gangs operate in the area, where migrants also try to cross the border into Texas.

An official said the victims may be undocumented migrants, reports AFP.

The north-eastern state of Tamaulipas is known for violent killings and disappearances, often linked to powerful drug cartels who battle for territory.

The former Florida governor told reporters Trump should read his book, "Immigration Wars," if he wants to learn how to deal with illegal immigration. Earlier, he met privately with local, state and federal officials in this city along the Rio Grande across from Reynosa, Mexico.

Trump has proposed building a massive border fence and kicking out the estimated 11 million people who are in the U.S. illegally before allowing the "good ones" and "talented" ones back in.