The Hawks have arrested two men in Mpumalanga for transporting drugs worth more than R1.5 million.
The drugs appear to have originated in Mozambique and was en route to Gauteng, said Hawks spokesperson Colonel Katlego Mogale.
Two Mozambicans - aged 26 and 38 - were expected to appear in the Emalahleni Magistrate's Court on Friday. The arrests took place on Wednesday.
"They were arrested in an intelligence-driven operation by the Middelburg-based Hawks' Serious Organised Crime Investigation team on the N4 highway near the Bethal off-ramp," said Mogale.
"Police received information about a truck that was transporting drugs from Mozambique to the Gauteng province. They proceeded to the freeway, where a truck with two foreign nationals was stopped."
During a search of the vehicle, officers found a newly welded compartment at the back of the truck.
"The drugs had an estimated street value of more than R1.5 million."
Both men were arrested and charged with possession of drugs.
Never miss a story. Choose from our range of newsletters to get the news you want delivered straight to your inbox.