BREAKING | US military enforces maritime blockade, threat level raised to 'severe' across Strait of Hormuz, Persian Gulf The Joint Maritime Information Center has issued a severe threat advisory following the activation of US military blockade enforcement operations across the Gulf, Strait of Hormuz, Gulf of Oman, and Arabian Sea. Vessel owners, operators, and mariners in the region are advised to maintain extreme vigilance and contact NAVCENT NCAGS or UKMTO immediately for further operational directives.