Shoppers at Lakeside Mall in Benoni ran for cover as a heavily armed gang robbed a store on Wednesday afternoon.
Police say the gang fired shots randomly, injuring a female worker inside a store.
No arrests have been made yet.
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Gauteng police spokesperson Colonel Mavela Masondo said the suspects travelled in three vehicles.
"On their way out, the suspects started shooting randomly as they were running towards their getaway vehicles - three sedans," Masondo said.