The four were from the SA National Defence Force and the SA Police Service (SAPS), he said.
He named the officials and gave their ranks. They were: a brigadier general from the SA Air Force (SAAF) command post; a major from the SAPS operational response unit; a lieutenant colonel from the movement control office; and brigadier general from the SAAF commanding base.
The move follows the suspension of Chief of State Protocol ambassador Bruce Koloane on Thursday, during a probe into how a Gupta family chartered jet was allowed to land at Waterkloof Air Force Base.
"Preliminary investigations have revealed the need to probe the circumstances under which the clearances for the aircraft to land were secured," departmental spokesperson Clayson Monyela said at the time.
Koloane's deputy would assume responsibility in the interim.