The Office of the National Security Adviser has denied allegations that it procured a deadly chemical substance, thallium sulphate, describing the claim as false and unfounded.
The denial followed a letter written by former Kaduna State Governor, Nasir El-Rufai, to the National Security Adviser, Nuhu Ribadu, alleging that the ONSA imported about 10 kilogrammes of the highly toxic compound from a supplier in Poland.