US-Iran Ceasefire at Risk After Ship Seizure in the Gulf

The United States has seized an Iranian cargo ship and reported multiple vessels coming under fire in the Gulf, pushing a fragile ceasefire with Tehran to the brink of collapse, according to verified reports from U.S. Defense and maritime security sources.

The seizure occurred on April 18, 2026, when U.S. Naval forces intercepted the MV Saviz, an Iranian-flagged vessel suspected of smuggling weapons and dual-use technology to Houthi forces in Yemen, in international waters near the Strait of Hormuz. The ship was taken to a U.S.-allied port for inspection under maritime interdiction authorities tied to counter-terrorism sanctions.

Separately, two commercial vessels — one flagged to Panama and the other to the Marshall Islands — reported coming under small-arms fire from fast-attack craft believed to be operated by Iran’s Islamic Revolutionary Guard Corps Navy (IRGCN) in the northern Gulf on April 19. No casualties were reported, but both ships sustained minor damage and altered course to avoid further engagement.