Iranian officials on Friday denied giving any assurances to Gibraltar to release its tanker, now sailing on into the Mediterranean, calling it a "victory" for Tehran. The ships seizure, with the help of British Royal Marines, had triggered a sharp deterioration in relations between Iran and Britain. Gibraltars Supreme Court lifted the detention order on Thursday after it said Tehran had given written assurances that the ship would not discharge its oil in Damascus. The ship had been detained on suspicion that its cargo was destined for the Banias oil refinery in Syria, breaching an EU embargo. However, Tehran denied it had provided any assurances to secure the ships release, saying Gibraltar was only seeking to "save face". "Iran has given no assurances over the Grace 1 not going to Syria to secure its release," foreign ministry spokesman Abbas Mousavi was quoted as saying Friday, according to AFP. "The tankers destination was not Syria ... and even if it was, it did not concern anyone else." Government spokesman Ali Rabiei hailed a victory for Iran that he said had been achieved without making any concessions. "Our illegally seized oil tanker is set free. This victory without giving any collateral is the result of #powerful_diplomacy and strong will to fight for a nations rights," Rabiei said in a tweet. “Based on the owner’s request, the oil tanker Grace 1 will depart for the Mediterranean after being reflagged under the Iranian flag and renamed Adrian Darya after preparing for the journey,” Reuters cited Jalil Eslami, deputy head of Iran’s Ports and Maritime Organisation, as saying: "At the owners request, the Grace 1 will depart for the Mediterranean after being reflagged under the Republic of Irans flag and renamed as Adrian Darya for the voyage." The ship was originally Panama-flagged and is carrying two million barrels of Iranian oil, he noted.