Police spokesperson, Malebo Khosana, earlier said the employees were on duty at the Vet River Waterworks last Wednesday at about 17:30 when the two armed suspects, covered with balaclavas, entered the building.
He says they were armed with a knife and pistol. Khosana says they then tied the victims up with nylon rope and took their cellphones and 20 metres of copper cable valued at R30 000.
The suspects later fled with an unknown vehicle. An investigation into the matter continues.