Updated at 12:55 p.m. ET
Gibraltar has released an Iranian oil tanker that was detained last month by Britain, despite a last-minute request by the U.S. to take possession of the vessel.
Grace 1 was raided on July 4 in the waters off the coast of Gibraltar, a British territory, by Britain's Royal Marines. The tanker was impounded on suspicion of transporting oil to Syria — a breach of European Union sanctions against Syrian President Bashar Assad's regime. It was said to be carrying 2.1 million barrels of crude oil.