Former Kaduna State Governor, Nasir Ahmad El-Rufai, has accused the Office of the National Security Adviser, ONSA, under Nuhu Ribadu of procuring thallium sulphate, a highly toxic chemical compound, and has demanded urgent clarification over the alleged transaction. El-Rufai made the allegation on Sunday in a post on X, where he shared a copy of a letter addressed to the Office of the National Security Adviser in Abuja. “As part of my duty as a citizen, I wrote to the NSA to seek clarification on reports about the importation by his office of thallium sulphate, a very dangerous toxin. It’s a matter of concern if anyone brings in any poison, more so an odourless, colourless one,” El-Rufai wrote on X. In the letter, he said information available to opposition political leaders indicated t...