The United States has imposed a blockade on all ports in Iran’s Gulf region, according to the U.S. Central Command. The blockade officially began at 5:30 p.m. local time on Monday, April 13, 2026. It applies to vessels of any national flag heading to or departing from Iranian ports, which may be intercepted, redirected, or seized. However, the measure does not apply to ports in other Gulf countries. The Central Command stated on social media that the blockade covers all ships positioned in the Arabian Sea east of the Strait of Hormuz and the Gulf of Oman, warning that unauthorized entry or exit will prompt action.

Iran’s Islamic Revolutionary Guard Corps strongly condemned the move, calling it “illegal” and “maritime piracy.” A spokesperson warned that no port in the Persian Gulf or the Gulf of Oman would remain safe unless the security of Iranian ports is ensured. The blockade follows earlier restrictions by Iran on shipping through the Strait of Hormuz after conflict erupted on February 28.

Given that nearly 20 percent of global energy supplies pass through this route, the blockade is expected to significantly affect the international energy market.