The proportion of vessels not linked to Iranian ownership that are transiting the key Strait of Hormuz has risen, according to data from maritime firm Lloyd's List Intelligence shared Thursday. Adding to the uncertainty, Iranian forces have fired at four ships attempting to cross the Strait of Hormuz without authorisation, state broadcaster IRIB reported Thursday.

Iranian forces fired at four vessels attempting to cross the Strait of Hormuz, according to state broadcaster IRIB.

Iranian naval forces reportedly intercepted four vessels, including an American oil tanker, which allegedly attempted to transit the Strait of Hormuz without first coordinating…