The 4,999-dwt Naniwa Maru No 1 (built 1992) was boarded by six armed pirates at around 1am local, Malaysian maritime police said on Wednesday.
Reports say the pirates also offloaded over 5m litres of diesel from the hijacked ship into two waiting vessels.
The Japanese-flagged tanker, which was en route to Myanmar from Singapore, had Indonesian, Thai, Myanmar and Indian crew members.
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