Middle East live: Iran warns against attempts to cross Strait of Hormuz without authorisation

Summary

Iran's Revolutionary Guards said Thursday they would take "appropriate measures" against vessels attempting to sail through the Strait of Hormuz without Tehran's authorisation. The warning comes as top US diplomat Marco Rubio visits Bahrain after promising Gulf allies that Washington will protect their interests as it seeks to hammer out a final settlement to end the war with Iran. Follow our liveblog for the latest developments.