Sacked national security adviser Sambo Dasuki has been charged in court with illegally possessing weapons, an official statement has said.
Firearms were seized during a raid on his properties last month, it added.
Mr Dasuki denied any wrongdoing at the time and said the weapons belonged to his security guards.
He is the first senior official of the former government to be charged under President Muhammadu Buhari’s rule.
He replaced Mr Dasuki and other security chiefs in a renewed effort to end a six-year insurgency by militant Islamist group Boko Haram.
The Department of State Security said the decision to charge Mr Dasuki in court was in line with its commitment to upholding democratic values.
No-one was above the law, no matter how highly placed they were in society, it added in a statement.