The unarmed men docked on Tho Chu island, off southwest Vietnam, on a lifeboat yesterday morning after "saying they encountered an accident at sea", Major General Ngo Ngoc Thu, deputy commander of the Vietnam Marine Police, told AFP.
Malaysian authorities have been searching for eight men since yesterday when they escaped the MT Orkim Harmony in a lifeboat.
It was the latest vessel to be targeted by increasingly bold pirates behind an upsurge of sea hijackings in Southeast Asia in the past two years, typically targeting smaller tankers carrying valuable petrol, diesel or gas oil.
"If they are the hijackers Malaysia is looking for, we will follow the laws, relations between the two countries and international practice to handle the situation," he told AFP.
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MT Orkim Harmony, carrying around 6,000 tonnes of petrol worth an estimated USD 5.6 million, went missing on June 11 en-route from Malaysia's western coast to the port of Kuantan on the east coast.
The pirates had managed to slip away by ordering naval vessels to stay at least five nautical miles from the ship or the crew would be harmed.
The London-based International Maritime Bureau has repeatedly warned that Southeast Asian waters are now the world's most piracy-prone, calling for decisive action by regional authorities to prevent the situation spiralling out of control.