Police spokesman Colonel Moatshe Ngoepe, said the officers who were conducting speed trap duties along the Slaagboom road outside Groblersdal stopped a grey VW Polo TSI without number plates.
He also added the car had five occupants and the driver was exceeding the speed limit.
“The suspects are unknown and no arrest has been made and the investigation is continuing,” Ngoepe said.
“While they were busy issuing the driver with a written notice, three passengers alighted, two of them armed with rifles and the other one with a pistol. They robbed both the officers and took two cellphones, a firearm, and the equipment before they fled the scene.
He further added that a multi-disciplinary task team had been established to hunt down the suspects.