Vietnamese coast guards last Friday caught two Thai boats smuggling fuel to two Vietnamese fishing boats in the southwestern waters off off Phu Quoc Island.
One of the Thai boats was carrying around 100,000 liters of diesel with three Thai people and four Cambodians aboard.
The other, which was carrying 300,000 liters of the oil, had six Cambodians, together with four Thai and a Lao person.
The Vietnamese boats had around 30,000 liters.
They could not produce legal documents for the oil.
According to the coast guards, crew members on the Thai boats said they had been “transferring” oil to Vietnamese fishing boats illegally.
They said they had done that many times before.
The Coast Guard Command in the area have kept the boats and are questioning the people involved.