A multi-disciplinary narcotics team arrested three suspects who left OR Tambo International Airport in a car allegedly containing drugs worth R3m.
The trio were tailed from the airport by members of a K9 (dog) unit and were stopped in Boksburg North.
"During an intelligence-driven operation, the multi-disciplinary narcotics team at Ortia (O.R. Tambo International Airport) responded to information on suspects who were transporting drugs from the airport," police spokesperson colonel Brenda Muridili said.
Police stopped and searched the car and found a "white powdery substance suspected to be heroin".
"This substance will be sent to the police forensic laboratory for further testing."
The suspects will appear in the Boksburg magistrate's court on charges of possessing and dealing in drugs.