A massive explosion tore through Iran's largest commercial port on Saturday, triggering a major blaze that has killed 14 people and injured 750 so far. The blast occurred at Shahid Rajaee Port in southern Iran, near the Strait of Hormuz, through which a fifth of the world's oil output passes. The cause of the blast remains unclear, but the port's customs office said it likely stemmed from a fire at a hazardous materials storage depot, state TV reported.