STOCKHOLM    -   ” Stena Impero, the British-flagged tanker detained by Iran on July 19, may be released within hours, the head of the Swedish firm that owns the vessel said on Sunday. The Stena Impero was detained by Iran’s Revolutionary Guards in the Strait of Hormuz waterway for alleged marine violations, two weeks after Britain seized an Iranian tanker off Gibraltar. That vessel was released in August. Swedish public broadcaster SVT quoted Stena Bulk Chief Executive Erik Hanell as saying: “We have received information now this morning that it seems like they will release the ship Stena Impero within a few hours. So we understand that the political decision to release the ship has been taken. We hope to be able to head out within a few hours, but we don’t want to anticipate events.