​Four crewmen from a Malaysian tugboat have been kidnapped by Filipino gunmen in the second attack to have taken place in a week.

Local authorities have confirmed that eight armed men boarded the Malaysia-flagged tug Massive 6 (built 2002), while it was returning from the Philippines to Malaysia, on Friday night.

The four Malaysian seamen were held hostage while  foreign crewmembers were left unharmed, the StarOnline reports.

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