Malaysian maritime authorities have detained two oil tankers off the coast of Penang, suspected of conducting unauthorised ship-to-ship (STS) transfer activities, the Malaysian Maritime Enforcement Agency said on 31 January 2026.
The vessels were inspected after a patrol boat responded to a report of tankers anchored about 24 nautical miles west of Muka Head where they were found moored together in a configuration consistent with transfer operations. Authorities seized crude oil valued at more than RM512 million (≈ US$129.9 million) from the two tankers.
There were 53 crew members aboard the vessels, comprising nationals from China, Myanmar, Iran, Pakistan and India. The two ship captains were arrested and handed over to Penang state maritime investigation officials for further action.
Malaysia is enforcing action under the Merchant Shipping Ordinance 1952 for anchoring without permission and conducting unauthorised transfer activities; penalties under the law include fines per vessel.
Officials did not specify the identities of the tankers or the origin of the crude oil being transferred.
Why it matters for maritime
Unauthorized STS transfers pose regulatory and safety concerns for coastal states and the international shipping community. In Malaysia’s waters, unregulated STS operations have been observed previously and can obscure cargo provenance, complicate enforcement of maritime safety and environmental rules, and raise potential issues related to sanctions compliance and documentation integrity.
Port states have authority to regulate anchoring and transfer activities in their territorial waters and exclusive economic zone; this detention underscores active enforcement efforts in Southeast Asian waters to uphold maritime law and safe practices.
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