A retired military officer has appeared before a Ghana court in connection with an alleged plot to destabilise the government ahead of elections.
Kufuor is expected to win the December poll
The retired officer, Nicholas Owuba, was charged with illegally purchasing military equipment, and the possession of firearms and ammunition.
Six other men, arrested on the weekend, have not yet appeared in court.
President John Kufuor is the favourite to win a presidential election due to be held on 7 December.
The authorities have underlined that no serving member of the army had been arrested.
Mr Owuba's lawyer has said it is not unusual for ex-army personnel to keep gadgets, such as those found on his clients veranda, Ghanaian GBC radio reports.
Ghana's capital Accra is reported to be calm, with no military presence.
The country suffered a number of coups in the 25 years after independence in 1957, but in recent times it has become one of West Africa's few havens of stability.
Next month's ballot will be the fourth multi-party polls held in the country since it embarked on its present democratic path.
Mr Kufuor took office four years ago, after former President Jerry Rawlings stood down after a second term in office.
Mr Rawlings had seized power in a coup in 1979 coup when he was a 32-year-old air force pilot.