That should lower tensions (and the price of oil)

Gibraltar says it no longer has any grounds to keep the Grace 1 detained. The ship had been accused of smuggling Iran oil to a country under EU sanctions. However Gibraltar says it has written assurances from Iran that the oil will not go to an EU-sanctioned destination.

However the US has continued to request detention of the ship. Gibraltar says that is a matter for mutual legal assistance authorities who will make an objective determination.