Spokesperson Phindi Mjonondwane said their evidence also proved that the man was acting alone, but she was unable to comment on the evidence which was available.
"At this stage we don't have information that suggest that this was a coup plot as the NPA," she told reporters outside the Johannesburg Magistrate's Court.
Elvis Ramosebudi briefly appeared in a packed courtroom before Magistrate Vincent Ratshibvumo on Tuesday. Ramosebudi came up the dock and seemed unfazed by all the attention from journalist, as he smiled and greeted his lawyer.
The 33-year-old was arrested last week Wednesday, bu the Directorate for Priority Crime Investigation (Hawks), who said in October investigators intercepted communication of possible assassinations, which were being planned.