Ship traffic traveling through the Strait of Hormuz has ground to a halt since President Donald Trump called the ceasefire between the United States and Iran “over.”

The Strait of Hormuz is a major world oil shipping hub. Located between the Persian Gulf and the Gulf of Oman, control over the strait is currently being contested by U.S. and Iranian officials. Considered critical to the world’s oil production, the narrow passage provides the only way for ships to travel from the Persian Gulf to the Arabian Sea before reaching the Indian Ocean.