Three of the seven men were crew of a craft that belongs to a marine service provider, and the other four were members of a foreign-registered tugboat.

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According to local media, initial investigations showed that the three crew members had allegedly misappropriated 2.7 tonnes of marine gas oil without their company knowing. After that, they sold it to the four crew members of the tugboat.

As a result, the tugboat as well has been seized for investigations.

Commenting on the arrest, the police and MPA said that they take cases of illegal transaction of marine fuel in Singapore waters very seriously.

Now, the police coast guard will carry out security checks to prevent such illicit activities in Singapore.