Four men, aged between 26 and 40, have been arrested by the Police Coast Guard for fraudulent possession of marine gas oil.
A statement released by the Singapore Police Force on Tuesday (July 19) said that officers had checked on a foreign registered tug boat at the sea off northern Tuas at about 4pm on July 18.
During the check, approximately 25 metric tons of marine gas oil was found hidden in the buoyancy chambers of the tug boat.
The men were unable to provide a satisfactory account of how they had come to possess the marine gas oil.
They were arrested and the tugboat was seized for investigations.
The four men will be charged in court on July 20.
If convicted, they may be fined or jailed for up to one year, or both.
Police Coast Guard Commander Hsu Sin Yun said that the illegal transaction of marine gas oil is a serious offence and strict enforcement action will be taken against offenders.