The Hyundai car dealership on the corner of Welgedacht and Boksburg roads was broken into last Sunday morning.
The security guard on duty told police he was guarding the outside perimeter of the business when he was overpowered by two men armed with pistols.
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After the men tied the guard up using his shoelaces, the men left him alone and headed to the showroom.
They smashed the showroom window with a brick and once inside went to the offices, where they grabbed two laptops and one desktop computer before fleeing on foot.
There were no injuries reported and no shots fired during the robbery.
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