ONSA denies buying thallium sulphate and challenges Nasir El-Rufai to submit evidence to the DSS for investigation.
The Office of the National Security Adviser (ONSA) has officially broken its silence regarding the heavy allegations leveled against it by the former Governor of Kaduna State, Nasir El-Rufai.
In a direct response, the ONSA challenged El-Rufai to bring his evidence forward to the Department of State Services (DSS).
The controversy started when El-Rufai claimed that the ONSA, under the leadership of Nuhu Ribadu, had allegedly procured about 10 kilograms of thallium sulphate.
For context, thallium sulphate is an extremely dangerous chemical. It is colorless, odorless, and highly toxic even a small amount can be fatal to humans.
According to El-Rufai, the substance was reportedly brought in from a supplier in Poland. He had earlier demanded that the security office clarify why such a lethal compound was being purchased.
In a letter dated February 13, 2026, and signed by Brigadier-General OM Adesuyi on behalf of the National Security Adviser, the ONSA categorically denied the claims.
The office stated clearly that it has not bought, nor does it have any plans to buy, such a substance.
The ONSA didn't stop at a denial. The office confirmed that the matter has now been handed over to the DSS for a full-scale investigation.
They noted that El-Rufai, along with any other individuals claiming to have information, will be invited by the DSS to provide proof to help get to the bottom of the matter.
The delivery of the official response was not without its own share of drama. Reports indicate that when a dispatch clerk first tried to deliver the letter to El-Rufai’s residence in Abuja, security guards turned him away.
The guards reportedly claimed their head of security was unavailable and they weren't sure when the former governor would be around.
However, the document was eventually delivered and signed for on Sunday by the head of security.
With the DSS now involved, the ball is firmly in El-Rufai’s court to substantiate his claims regarding the alleged chemical procurement.
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