Earlier in the day, Gibraltar said no to the US Department of Justice's demand to re-seize the tanker, which has now changed its name to Adrian Darya 1.
The Iranian tanker was stopped and seized by the British Navy in the Mediterranean on July 4, on suspicion of carrying crude oil to Syria in violation of EU sanctions.
Accused of crimes by the United StatesIran, closely allied with the regime in Damascus, called the measure "piracy" and has since seized, among other things, seized a Swedish-owned vessel in the Strait of Hormuz, on unclear grounds.
The United States believes that Grace 1 can be linked to money laundering and terrorist offenses, and protested when Gibraltar decided earlier this week to release the ship. It happened after Iran has made a statement not to violate EU sanctions - something Tehran denies.