"The suspects instructed the crew to exit the vehicle, threatening them with explosives."
Muridili said the gang blew up the van, causing extensive damage to the loading bins and safes. The suspects escaped with an undisclosed sum of money and firearms taken from the security guards.
The van driver sustained knee injuries while another guard was shot in the hand.
Muridili said the gang opened fire on a police helicopter that was in the area, forcing it to make an emergency landing.
No arrests were made.
The Hawks have taken over the investigation.