The Office of the National Security Adviser (ONSA) in Nigeria has formally denied allegations that it procured approximately 10 kilograms of thallium sulphate, a highly toxic chemical, and has challenged former Kaduna State Governor Nasir El-Rufai to submit any evidence to the Department of State Services (DSS) for investigation. The dispute, which involves a chemical with lethal toxicity, raises supply-chain scrutiny for importers and distributors of controlled substances in Nigeria.
Allegation and denial
Former Governor El-Rufai accused ONSA of procuring thallium sulphate, reportedly sourced from a supplier in Poland, and demanded urgent clarification. In a response dated February 13, 2026, Brigadier-General OM Adesuyi, on behalf of the National Security Adviser, stated that ONSA has neither procured nor initiated any process for purchasing such material and has no intention of doing so.
Referral to security services
The ONSA has formally referred the allegation to the DSS for a comprehensive investigation. The response invites El-Rufai and other parties with relevant information to provide evidence to the Service to assist in establishing the facts and ensuring due diligence.
Compliance and logistics signals
For chemical importers and distributors, this case highlights the strict regulatory environment surrounding toxic substances like thallium sulphate in Nigeria. Companies dealing with controlled chemicals should ensure full documentation and compliance with local security agency requirements, as any procurement of such materials may trigger government scrutiny.
China sourcing context
While the alleged supplier was in Poland, the incident underscores the importance of verifying end-user certificates and regulatory approvals when sourcing toxic chemicals globally. Chinese exporters of controlled substances should be aware that Nigerian authorities are actively monitoring procurement of hazardous materials, and any irregularities could lead to investigations involving security agencies.
Source: Read the original report | Published: February 15, 2026