Tabasco state Civil Defense official Jorge Mendez Landeros said two of the victims died yesterday and two others at the moment of the fire. State health officials said two of the dead are children.
The Civil Defense agency said in a statement that the 15,800-gallon (60,000-liter) tanker crashed on the road between Villahermosa and Coatzacoalcos in southeastern Mexico on Thursday.
"Local residents using aggression and ignoring the directions of authorities began to collect the fuel without measuring the risks they were taking," the agency said.