Philippines warns of ’sabotage’ after cyanide seizure in disputed South China Sea atoll

Published 04/13/2026, 03:50 AM
Updated 04/13/2026, 03:54 AM
© Reuters.

MANILA, April 13 (Reuters) - The Philippines discovered cyanide on Chinese boats operating around a disputed atoll in the South China Sea, security officials from the country said on Monday.

Authorities said laboratory tests confirmed the presence of the highly toxic substance in bottles seized by the Philippine navy in operations at Second Thomas Shoal last year. 

Officials warned the cyanide could have had serious consequences for marine life and weakened the reef supporting a warship that Manila grounded on the atoll to reinforce its maritime claim.

"We wish to underscore that the use of cyanide in Ayungin Shoal is a form of sabotage that seeks to kill local fish populations, depriving Navy personnel of a vital food source," Cornelio Valencia, National Security Council spokesperson, told a press conference using the Philippines’ name for the atoll. Valencia added that cyanide could damage the reef and "ultimately compromise" the warship’s stability.

The Chinese Embassy in Manila did not immediately respond to a request for comment.

The Philippines has accused China of disrupting resupply missions to troops on the vessel, including a June 17, 2024, incident that turned violent and resulted in a Filipino sailor losing a finger. China has denied allegations of aggressive conduct during such encounters and accused the Philippines of trespassing in its waters.

The June confrontation later led to a provisional understanding for resupply missions to the grounded ship.

China and the Philippines held high-level talks last month over the South China Sea,  exploring preliminary steps towards oil and gas cooperation nL1N40V02J, and confidence-building measures at sea, including communication between their coast guards.  

The Philippine foreign ministry said in a statement on Monday the scope of the coast guard cooperation would be limited, and "does not contemplate cooperation in sensitive operational areas," adding that there had been no discussions on joint patrols.

China claims nearly all the South China Sea, including areas claimed by Brunei, Malaysia, the Philippines and Vietnam.

A 2016 ruling by an international arbitral tribunal found Beijing’s sweeping claims had no basis under international law, a decision China rejects. More than $3 trillion in annual ship-borne commerce travels through the key waterway.

Latest comments

Risk Disclosure: Trading in financial instruments and/or cryptocurrencies involves high risks including the risk of losing some, or all, of your investment amount, and may not be suitable for all investors. Prices of cryptocurrencies are extremely volatile and may be affected by external factors such as financial, regulatory or political events. Trading on margin increases the financial risks.
Before deciding to trade in financial instrument or cryptocurrencies you should be fully informed of the risks and costs associated with trading the financial markets, carefully consider your investment objectives, level of experience, and risk appetite, and seek professional advice where needed.
Fusion Media would like to remind you that the data contained in this website is not necessarily real-time nor accurate. The data and prices on the website are not necessarily provided by any market or exchange, but may be provided by market makers, and so prices may not be accurate and may differ from the actual price at any given market, meaning prices are indicative and not appropriate for trading purposes. Fusion Media and any provider of the data contained in this website will not accept liability for any loss or damage as a result of your trading, or your reliance on the information contained within this website.
It is prohibited to use, store, reproduce, display, modify, transmit or distribute the data contained in this website without the explicit prior written permission of Fusion Media and/or the data provider. All intellectual property rights are reserved by the providers and/or the exchange providing the data contained in this website.
Fusion Media may be compensated by the advertisers that appear on the website, based on your interaction with the advertisements or advertisers.
© 2007-2026 - Fusion Media Limited. All Rights Reserved.