A massive gas tanker overturned and exploded on a major highway near Iztapalapa and Chalco, unleashing a fireball that engulfed dozens of vehicles. At least 3 people were killed and 70 others injured, including children, many suffering severe burns. Hospitals are overwhelmed as survivors fight for their lives. This is the second major tanker disaster in Mexico this week — exposing serious concerns over safety, regulations, and oversight of propane transport.