Foreign ministers from the Group of Seven wealthy economies said Iran was threatening international peace and security and that all available evidence showed it was behind an attack on the Mercer Street tanker last week.
"All available evidence clearly points to Iran. There is no justification for this attack," the statement, issued by G7 chair Britain said.
"Iran's behaviour, alongside its support to proxy forces and non-state armed actors, threatens international peace and security.
"We call on Iran to stop all activities inconsistent with relevant UN Security Council resolutions, and call on all parties to play a constructive role in fostering regional stability and peace."
(Reporting by William James, Editing by Paul Sandle)
