By Yusuf Danjuma Yunusa

Former Kaduna State Governor, Nasir Ahmad El-Rufai, has formally requested clarification from the Office of the National Security Adviser (ONSA) regarding the alleged procurement of a highly toxic chemical substance, Thallium Sulphate.

In a letter dated January 30, 2026, and addressed to National Security Adviser (NSA) Nuhu Ribadu, El-Rufai stated he was acting “as a concerned citizen” to seek details about what he described as the procurement of approximately 10 kilograms of the substance, reportedly sourced from a supplier in Poland. The letter was received by ONSA on February 11, 2026.

According to Science Direct, Thallium sulfate is an extremely hazardous substance. It is a tasteless, odourless, and colourless crystalline powder historically used as a potent rodenticide and insecticide. Due to its extreme toxicity—with a fatal human dose estimated to be as low as 8 to 12 milligrammes per kilogramme—its use is tightly restricted or banned in many countries. The chemical mimics potassium in the body, leading to severe nervous system damage, hair loss, and potentially death.

The letter, titled “Request for Clarification on the Procurement of Thallium Sulphate,” raises several critical questions regarding the purpose, regulatory compliance, and safety measures surrounding the reported acquisition.

El-Rufai wrote that he was seeking clarification as a concerned citizen based on information available to the political opposition leadership about a procurement of approximately 10 kilogrammes of Thallium Sulphate by ONSA, reportedly from a supplier in Poland. Highlighting the grave danger posed by the substance, he stressed the need for transparency, noting that because thallium salts are highly toxic and tightly controlled substances, it was important for public safety, democratic accountability, and maintaining public trust to confirm specific details.

He therefore sought clarification on the intended purpose and end-use of the imported Thallium Sulphate, the supplier’s identity, and whether the material was imported under an existing chemical or defence permit. He also requested information on the total quantity and specific form or concentration being procured or already procured, as well as the storage and security arrangements for the material upon arrival.

Furthermore, he asked about the regulatory oversight and coordination with NAFDAC, NCDC, and relevant public-health and environmental agencies, and whether any public-health risk assessments or hazard-mitigation plans had been developed given the compound’s extreme toxicity.

El-Rufai emphasised that his inquiry was made in good faith, with the sole aim of ensuring due process and transparency, rather than inflaming political tensions. He stated that public confidence in the integrity of national institutions is strengthened when potential risks are openly addressed and managed.

The former governor requested continued dialogue with the NSA’s office on the matter and expressed appreciation for a response or a point of contact within the office for further engagement to reassure concerned Nigerian citizens in the opposition.

In a move underscoring the demand for transparency, El-Rufai copied the correspondence to the Directors-General of the National Agency for Food and Drug Administration and Control (NAFDAC) and the Nigeria Centre for Disease Control (NCDC), as well as the National Chairmen of the African Democratic Congress (ADC) and the Peoples Democratic Party (PDP).

The inquiry comes amid recent political tension, following claims by the former governor that NSA Ribadu ordered his arrest, an incident that led to a recent altercation at the Nnamdi Azikiwe International Airport in Abuja. It also follows El-Rufai’s assertion that an individual had intercepted a phone conversation confirming the NSA’s involvement in the alleged arrest attempt.