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By Marco Trujillo and Jon Nazca
GIBRALTAR (Reuters) - An Iranian tanker caught in the standoff between Tehran and the West shifted position on Friday, but its anchor was still down off Gibraltar and it was unclear if it was ready to set sail soon.
Gibraltar authorities could not be reached for comment.
The Grace 1 was seized by British Royal Marines at the western mouth of the Mediterranean on July 4 on suspicion of violating European Union sanctions by taking oil to Syria, a close ally of Iran.
Gibraltar lifted the detention order on Thursday but the vessel's fate was further complicated by the United States, which made a last-ditch legal appeal to hold it.
The Gibraltar Chronicle newspaper reported that the vessel was unlikely to sail before Sunday, citing an unnamed source who added that it was waiting for six new crew members including a captain to arrive that day.
A lawyer for the Grace 1's current captain also told the newspaper that his client had asked to be replaced.
The vessel had appeared to be moving and more smoke could be seen coming from the funnel than in recent days. However, it was not clear that the ship was actually leaving, and it still appeared to be at anchor.
Refinitiv data did not show the vessel moving.
Gibraltar's chief minister, Fabian Picardo, said earlier that the tanker was free to leave as soon as it had organized its logistics.
"Could be today, could be tomorrow," Picardo told BBC Radio.
The Grace 1 had its name erased and it was no longer flying a Panama flag.
On Friday afternoon a Spanish Civil Guard boat briefly stood close to the tanker with police officers taking pictures. It was closely followed by a Royal Navy boat.
Washington has attempted to detain the Grace 1 on the grounds that it had links to Iran's Islamic Revolutionary Guard Corps (IRGC), which it has designated a terrorist organization.
A federal court in Washington on Friday issued a warrant for the seizure of the tanker, the oil it carries and nearly $1 million.
"The scheme involves multiple parties affiliated with the IRGC and furthered by the deceptive voyages of the Grace 1," the U.S. attorney for the District of Columbia, Jessie Liu, said in a news release. "A network of front companies allegedly laundered millions of dollars in support of such shipments."
The U.S. State Department did not immediately respond to a request for comment on how the warrant, which was addressed to "the United States Marshal's Service and/or any other duly authorized law enforcement officer," may be enforced. The Pentagon declined to comment.
Asked earlier about Washington's position, Picardo said that would be subject to the jurisdiction of Gibraltar's Supreme Court. "It could go back to the court absolutely."
The last-minute U.S. intervention was the latest twist in a saga that started in the early hours of July 4, when British Royal Marines abseiled onto the Grace 1 to impound the ship.
That kicked off a sequence of events that saw Tehran seize a British-flagged oil tanker in the Gulf two weeks later, heightening tension on a vital international oil shipping route.
That tanker, the Stena Impero, is still detained.
The two vessels have since become pawns in a bigger game, feeding into wider hostilities since the United States last year pulled out of an international agreement to curb Iran's nuclear program, and reimposed economic sanctions.
Gibraltar said it had found evidence confirming the Grace 1 was carrying its cargo - 2.1 million barrels of oil - to the Baniyas refinery in Syria. Tehran denies that.
Gibraltar Chief Minister Picardo said on Thursday he had agreed to release the ship after receiving written assurances that the cargo would not go to Syria. Tehran also denied that it had made any commitments to secure the release of the tanker.
U.S. Secretary of State Mike Pompeo warned all mariners that if they crewed a ship affiliated to the Revolutionary Guard, they would jeopardize their ability to enter the United States. "#NotWorthIt," he tweeted.
Calling the U.S. attempt to block the tanker "piracy" and denying any commitments had been made to secure its release, Iranian officials have said Grace 1 would sail shortly after the 25-member crew made preparations including refueling.
"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," Iranian state television quoted Jalil Eslami, deputy head of the country's Ports and Maritime Organisation, as saying.
(Writing by Kate Holton and Joan Faus; Additional reporting by Eric Beech in Washington, and Dubai and Madrid newsrooms; Editing by Angus MacSwan, Frances Kerry, Hugh Lawson and Leslie Adler)