The Office of the National Security Adviser (ONSA) has dismissed allegations by former Kaduna State governor Nasir El-Rufai that it procured a dangerous chemical substance, urging him to submit any evidence to security agencies. El-Rufai had written to the National Security Adviser, Nuhu Ribadu, claiming that about 10 kilograms of thallium sulphate — a highly toxic chemical — had allegedly been sourced from a supplier in Poland. In a response dated February 13, 2026, and signed by Brigadier-General O.M. Adesuyi on behalf of ONSA, the office categorically denied initiating or completing any such purchase. The letter stated that ONSA had neither procured nor begun any process to obtain the substance and had no plans to do so. The office further disclosed that the allegation has been forma...