The Iranian oil tanker at the centre of an international incident has been sailing just off the Syrian coast, satellite images appear to show, APA reports citing BBC.
The Adrian Darya-1 was seized by Gibraltar in July with the aid of British forces over fears it was bound for Syria, violating EU sanctions.
It was eventually released after assurances were given that it would not head for the war-ravaged country.
But images released on Saturday seemed to show it two nautical miles offshore.
The images, from US company Maxar Technologies, appeared to place the tanker very close to the Syrian port of Tartus on 6 September.
US National Security Advisor John Bolton tweeted that anyone who believed the ship was no longer headed for Syria was "in denial".
"Tehran thinks it's more important to fund the murderous Assad regime than provide for its own people," he said, alongside another satellite picture. "We can talk, but #Iran's not getting any sanctions relief until it stops lying and spreading terror!"
There is however no confirmation that the ship is unloading its cargo of 2.1 million barrels of Iranian crude oil.
Neither Iran nor Syria have commented.
In a statement, the UK's Foreign Office called the reports "deeply troubling".
A spokesperson said that if Iran had broken its assurances, it would be "a violation of international norms and a morally bankrupt course of action".