The Bureau of National Investigation (BNI) is holding one Mr Kwame Gyebi, a resident of Dzorwulu in Accra, on grounds of a planned assassination plot on President John Mahama.
Details of the case are sketchy but BNI officials say they are investigating.
However, security sources say the 33-year-old man was overheard saying the President will fall when delivering his Independence Day speech on March 6, insisting he knew exactly how that will happen.
BNI officials have confirmed Mr Gyebi was initially arrested by the Ghana Police on February 25, 2016 and handed over to them for further investigations.
They say investigations are ongoing to ascertain the motives behind Mr Gyebi’s pronouncement and whether he is acting alone or with others.