The office of the national security adviser (ONSA) has directed Nasir el-Rufai, former governor of Kaduna state, to submit evidence of the alleged procurement of thallium sulphate to the Department of State Services (DSS) for further investigation.
Thallium sulphate is a highly toxic, colourless and
odourless compound that can kill humans in small doses.
In a letter dated January 30, 2026 and addressed to Nuhu
Ribadu, the national security adviser, el-Rufai had said the substance was
reportedly sourced from a supplier in Poland.
TheCable. quoting sources, reports that ONSA replied him, denying the allegation and asking him to supply any evidence he has to the DSS for a thorough investigation.
However, TheCable was informed that a copy of the response
sent to el-Rufai’s Abuja address was rejected by the security operatives on
duty on Friday.
They reportedly told the dispatch clerk that the head
security was not on the ground and that they did not have an idea of when
el-Rufai would visit.
However, it was eventually delivered on Sunday and the head
of security signed and received it on behalf of el-Rufai.
The response, written by OM Adesuyi, a brigadier-general, on
behalf of the NSA, and seen by TheCable, was dated February 13, 2026.
Adesuyi wrote: “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.”
On Friday, el-Rufai had also said he accessed an intercepted
telephone conversation involving Ribadu.
Speaking on Prime Time, an Arise Television programme, he
said “someone tapped” Ribadu’s phone and that he listened to the NSA allegedly
directing security operatives to arrest him.
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