The ReCAAP Information Sharing Centre (ISC) said the tug Marcopolo 17 was attacked in the early hours of 19 August off Pulau Tekong, while towing a barge.
Four men armed with knives boarded the vessel from a speedboat.
They escaped with the crew’s personal belongings, rice and rations.
No injuries were reported.
Two days before, the 150-gt Singaporean tug Bina Marine 61 (built 2010) was raided by two men while in the same area.
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