USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation
MSCI Alert

2023-002A-Persian Gulf, Strait of Hormuz, Gulf of Oman-Threats to Commercial Vessels


A maritime threat has been reported involving two incidents of commercial vessels being seized by Iran, contrary to international law. The first was a Marshall Islands-flagged vessel on April 27th in the Gulf of Oman and the second a Panama-flagged vessel on May 3rd in the Strait of Hormuz. These reports have been confirmed. Exercise increased caution when transiting the Persian Gulf, Strait of Hormuz, and the Gulf of Oman. U.S. commercial vessels operating in these areas should review U.S. Maritime Advisory 2023-003 (Persian Gulf, Strait of Hormuz, Gulf of Oman, Arabian Sea, Gulf of Aden, Bab al Mandeb Strait, Red Sea, and Somali Basin - Threats to Commercial Vessels) for amplifying information and points of contact. This alert will automatically expire on May 10, 2023. Any maritime industry questions regarding this alert should be directed to For more information about U.S. Maritime Alerts and Advisories, including subscription details, please visit