Iran's Revolutionary Guards have reportedly seized a vessel in the Gulf for allegedly smuggling 250,000 litres of diesel fuel to the United Arab Emirates.
ISNA, a semi-official Iranian news agency, said on Monday: "It was detained near Iran's Greater Tunb island in the Persian Gulf.
"The crew have been handed over to legal authorities in the southern Hormozgan province."
There was no indication about the nationalities of the crew.
Iran, which has some of the world's cheapest fuel prices due to heavy subsidies and the fall of its national currency, has been fighting fuel smuggling by sea to Gulf Arab states.
There have been a series of incidents involving shipping in and near the Gulf since US sanctions on Iranian oil exports took full effect in May.
The Revolutionary Guards also seized British oil tanker Stena Impero in July, saying it had violated Iranian law. The crew members were released earlier this month.
The reported seizure coincided with raised international tensions following a weekend attack on a major oil installation in Saudi Arabia, Iran's longtime foe.
Responsibility for the strike was claimed by Yemen's Iran-aligned Houthi movement, but the United States has blamed Iran for the strike. Iran has denied the accusation.
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