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Gauteng police report that three prisoners were killed and 14 injured on Monday by an explosion in the truck in which they were being transported.
Brigadier Neville Malila says the prison truck was transporting 36 awaiting trial prisoners from the Randburg Magistrate's Court to Johannesburg Central Prison.
Malila says when they arrived at the corner of Naturena and the Old Soweto Highway, the driver heard a loud bang.
He saw two prisoners escape through a large hole in the door.
One of the escaping prisoners was shot and wounded and both recaptured.
Four of the injured prisoners are in a critical condition while 10 sustained minor injuries. The remaining 19 were unhurt.
Forensic experts were brought in to determine the type of explosive device used.
Correctional services commissioner Tom Moyane said they were not ruling out the possibility of an inside job.
