Iran has announced the "closure" of the Strait of Hormuz to all ships and oil tankers as tensions in the region flared following Iran’s downing of a US Army helicopter on Monday during a patrol in the region.Trump blamed Iran for the shotdown of the US AH-64 Apache attack helicopter.Tensions between the US and Iran have intensified in recent days amid broader regional conflict, including efforts to enforce blockades, protect commercial shipping and counter Iranian-backed actions. Iran has denied responsibility for unprovoked attacks and accused the US of aggression, while the US has described its operations as proportional and defensive.