The remains were found inside a large woven polypropylene bag beneath the bridge.
About 20 kilometers away, a burnt Citi Golf was also found.
It remains unclear who the vehicle belongs to or if it is linked to the victims.
ALSO READ: Abandoned burnt car found on Van Dyksdrift road
Middelburg police, along with emergency services, are on the scene.
Officers were dispatched at around 15:00.
A murder case has been opened.
The events leading to the incident remain unclear.
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