UNKNOWN
I had talks with Brigadier Loots as well as  with Commandant Charl Naude's Special Forces to plan the operation. Charl Naude told us that he had agents in Botswana and that he would arrange for one of those agents  to pass on the information when Mnisi was in the vehicle and Mackenzie not being in the vehicle at the time, so that the bomb could be activated by means of remote control. What happened there was that Mackenzie booked into a motel on the outskirts of Gaberone and one of these Paulo Demakudu or Mnisi would have fetched the combi from him, inserted the explosive and handed it back to Mackenzie.