The Department of Foreign Affairs (DFA) is preparing possible diplomatic action over the reported use of cyanide in waters near Ayungin Shoal, pending the release of a formal scientific report on the incident.
In a statement dated April 15, the DFA said it is “awaiting to receive the formal report of the findings from the scientific and technical analysis done by relevant authorities on the chemicals confiscated from Chinese fisherfolk in Ayungin Shoal last year,” noting that the document will guide its next steps.
“The formal report will serve as the basis for the DFA to evaluate and determine the appropriate diplomatic action to take on this matter,” the department said.
The issue stems from separate interdictions by Philippine forces on February 20 and October 24, 2025, when Navy personnel under the Armed Forces of the Philippines Western Command intercepted Chinese fishing boats operating near the BRP Sierra Madre, the country’s outpost in Ayungin Shoal. Authorities seized so-called “yellow bottles,” along with gloves and fishing gear, from the vessels.
These materials were later examined by the National Bureau of Investigation, whose forensic tests confirmed the presence of cyanide, a toxic chemical known to destroy coral reefs, kill fish, and pose risks to human health.
Earlier in April, National Security Council (NSC) Assistant Director General and Spokesperson Cornelio H. Valencia disclosed the laboratory findings, saying the cyanide-laced bottles were recovered “in the immediate vicinity” of the BRP Sierra Madre.
In a press conference, the NSC warned that such acts may constitute illegal destructive fishing and even “sabotage” of marine ecosystems and the food supply of Filipino troops and fisherfolk in the area.
The DFA underscored the broader legal implications of the incident, stating that “the use of cyanide and other similar toxic agents in the marine environment is irresponsible and unacceptable, and runs counter to obligations of States Parties under the 1982 UNCLOS, particularly the duty to protect and preserve the marine environment and prevent pollution at sea.”
Ayungin Shoal lies within the Philippines’ exclusive economic zone in the West Philippine Sea, a part of the broader South China Sea that remains a flashpoint for maritime tensions between Manila and Beijing.
China has denied the allegations, calling them unfounded and accusing Philippine authorities of harassing its fishermen.
Despite the competing claims, the DFA reiterated its position: “The Philippines will continue to monitor and call out any infringements on its sovereignty, sovereign rights, and jurisdiction across all its maritime zones.”
The anticipated report is expected to shape Manila’s next move as it balances environmental protection, food security concerns, and ongoing tensions in the contested waters.