NSA Ribadu challenges El-Rufai to submit evidence of alleged toxic chemical procurement

By Sabiu Abdullahi

The Office of the National Security Adviser (ONSA) has called on former Kaduna State governor, Nasir El-Rufai, to forward proof of his allegation concerning the purchase of a poisonous substance to the Department of State Services (DSS) for investigation.

The reaction followed claims by El-Rufai that the National Security Adviser’s office, led by Nuhu Ribadu, procured thallium sulphate, a toxic chemical compound. He had also alleged that the substance was sourced from a supplier in Poland and demanded clarification over the reported transaction.

Thallium sulphate is known to be a highly poisonous, colourless and odourless substance capable of causing death even in small quantities.

In its response, ONSA dismissed the allegation. The office urged the former governor to provide any evidence in his possession to the DSS to enable a detailed probe.

A formal reply to El-Rufai was issued in a letter signed by Brigadier-General OM Adesuyi on behalf of the National Security Adviser. The correspondence was dated February 13, 2026, and acknowledged an earlier message from the former governor.

“I have the honour to present the compliments of the National Security Adviser and to acknowledge receipt of Your Excellency’s correspondence received on 11 February 2026 requesting clarification regarding the alleged procurement of approximately 10 kilograms of Thallium Sulphate by the Office of the National Security Adviser (ONSA).

“The correspondence further indicated that information concerning the purported procurement is reportedly available to the political opposition leadership. In this regard, I am directed to respectfully convey that ONSA has neither procured nor initiated any process for the purchase of such material, and has no intention of doing so.

“However, I am further directed to state that the allegation has been formally referred to the Department of State Services for a comprehensive investigation. Your Excellency and other parties involved, who may possess relevant information relating to this claim will be duly invited by the Service to provide any evidence that may assist in an in-depth investigation, establishing the facts and ensuring due diligence.

“Please accept the assurances of the esteemed regards of the National Security Adviser.”

Sources indicated that an initial attempt to deliver the letter to El-Rufai’s Abuja residence was unsuccessful. Security personnel on duty reportedly declined to receive the document. They said the chief security officer was absent and could not confirm when the former governor would be available.

The correspondence was later delivered on Sunday. It was received and signed by the head of security on behalf of El-Rufai.