Johannesburg - Police are still searching for an eastern European man they believe could shed light on the Norwood arms cache, police said on Tuesday.
“His arrest will answer the questions we have about the guns,” Hawks spokesman Paul Ramaloko told Sapa.
He said the man's arrest was central to their investigations.
Three people were arrested on Thursday when police found more than 300 firearms, ammunition, and explosives at a house in Norwood, north of Johannesburg.
A Ukrainian couple and their domestic helper were arrested on allegations of renting out the weapons to hardened criminals for cash-in-transit heists and ATM bombings.
Police found R1 rifles, R4 rifles, R5 rifles, AK-47 rifles and about 300 handguns, detonators, a machine used to manufacture ammunition, packaged dagga, and explosives used for ATM bombings.
The three, Emma Shumler-Tishko, 62, her husband Mark, 59, and Endi Nkhoma, 26, appeared in the Johannesburg Magistrate's Court on Monday. The case was postponed to next week Tuesday for a bail application.
They face four charges - possession of unlicensed firearms, possession of ammunition, dealing in dagga, and contravention of the Explosives Act.
Ramaloko said the three would have to explain to the court why the weapons and explosives were on their premises. - Sapa