The captain and three officers from Grace 1, had their police bail lifted and were formally released without any charges, a Gibraltar government spokesman said.
Gibraltar government has released the Iranian supertanker Grace 1, despite the US' attempt to block the release of the vessel.
On July 4, the British Royal Marines seized the giant Iranian oil tanker in Gibraltar for trying to take oil to Syria allegedly in violation of European Union sanctions. The U.S. blamed Iran for recent aggression in the Gulf region, including tanker attacks, and the British Navy last month intervened to prevent Iranian vessels from impeding the journey of a tanker operated by BP Plc.
Gibraltar's attorney general spent most of Thursday considering a US Department of Justice application to detain the ship, before ruling that the vessel could be released.
Speaking in court, Chief Justice Anthony Dudley said before the final decision was made that were it not for the USA move, "the ship would have sailed", the Chronicle reported.
In past weeks, the Persian Gulf region has seen six attacks on oil tankers that the USA has blamed on Iran and the downing of a USA surveillance drone by Iranian forces.
He said there was no US application now before the court.
"A message to all mariners - if you crew an IRGC or other FTO-affiliated ship, you jeopardize future entry to the U.S.", Secretary Mike Pompeo said in a tweet on August 16.
Global seafarers' charity Stella Maris said it hoped the release of Grace 1 might in turn lead to the release of the Stena Impero's crew.
The seizing of the Grace 1 on allegations that it carried oil for Syria in violation of European Union sanctions against the country marked the start of tension between Iran and the United Kingdom, which progressed to Iran threatening an in-kind response, which came in mid-July when the Islamic Revolutionary Guard Corps seized British-flagged Stena Impero in the Persian Gulf.
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Those authorities "will make an objective, legal determination of that request", Picardo said.
The US Department of Justice did not immediately respond to a request for comment.
The court was told the Americans were asking for mutual legal assistance, the Gibraltar Chronicle reported.
The FCO said there is no comparison or linkage between what it calls Iran's "unacceptable and illegal" seizure of commercial vessels in the Strait of Hormuz, and Gibraltar's enforcement of EU Syria sanctions.
Will release of the Iranian tanker end Gulf crisis?
The decision to release the ship was taken hours after the United States launched a separate last-minute legal move to detain the vessel and its cargo, which is owned by the National Iranian Oil Company and is worth $140m.
The seizure of the Grace 1 triggered a row with Tehran, which accused Britain of piracy.
Tehran repeatedly called for the release of Grace 1, insisting it had been in worldwide waters and not headed to Syria. "You can not say that you won't allow our oil to be exported".
Britain has so far been the only one to express willingness to join a maritime security mission.
The spat between Tehran and London came amid rising tensions in the Gulf after the United States past year withdrew from the 2015 deal between world powers and Tehran.