Malaysian maritime authorities have detained two oil tankers and seized crude oil worth over $129.9 million after intercepting what they suspect were unauthorised ship-to-ship (STS) oil transfers in the busy shipping waters west of Muka Head, off Penang, the Malaysian Maritime Enforcement Agency (MMEA) confirmed.
The incident unfolded during the early hours of 29 January, when an MMEA patrol vessel received a report of suspicious activity approximately 24 nautical miles off Penang’s northwestern coast in the Straits of Malacca, a key route for energy shipments and global marine traffic.
On arrival at the reported location, enforcement officers found the two oil tankers anchored and moored alongside each other, a configuration that raised red flags for unauthorised STS crude transfer operations – a tactic often used to obscure cargo origin or evade detection.
During onboard inspection, authorities confirmed that the vessels were engaged in transfer activities, with crude oil cargo valued at over $129.9 million found on board. The exact origin of the crude oil has not been disclosed by officials.
Altogether, 53 crew members were identified across both tankers, including nationals from China, Myanmar, Iran, Pakistan and India. The captains of both vessels were taken into custody for questioning and possible charges.
According to Malaysian law enforcement, the case is being investigated under the Merchant Shipping Ordinance 1952, with suspected violations including anchoring without permission from maritime authorities and conducting illegal crude STS transfer activities – offences punishable by fines and further legal action.
The area off the coast of Penang is a recognised hotspot for illegal ship-to-ship transfers, particularly of oil products, where vessels may attempt to shift cargoes at sea to disguise their origin or destination and evade regulatory oversight. Malaysian authorities had indicated plans in 2025 to tighten enforcement of oil transfer rules in their territorial waters, a move reflected in this interception.
MMEA officials continue their investigation into the circumstances of the crude transfer and the vessels’ activities, while the tankers and their crews remain under detention pending further legal proceedings.
