CENTCOM begins naval blockade of Iranian ports at 10 a.m. ET

U.S. Central Command began enforcing a naval blockade of all Iranian ports at 10 a.m. ET, with the USS Gerald R. Ford and USS Abraham Lincoln carrier strike groups ordered to board or turn back any vessel bound for Iranian ports in the Arabian Gulf and Gulf of Oman. CENTCOM issued a Notice to Mariners directing ships to contact U.S. forces on channel 16 before proceeding through the region. Iran's armed forces declared the blockade illegal and an act of piracy under international law. The IRGC warned U.S. military vessels in the Strait would be treated as a ceasefire violation.