The South Korean owner of a tanker detained in the Strait of Hormuz has claimed "armed" Iranian forces boarded the vessel.

The 17,400-dwt Hankuk Chemi (built 2000) was detained on Monday en route to Fujairah and taken to the Iranian port of Bandar Abbas.

The crew of 20 received a 10 to 20 minute warning of the seizure, DM Shipping said in a statement to CNN.