Among a row of business offices in Sunninghill, Sandton, sits an unnamed, unnumbered three-storey building. It seems out of place: against the backdrop of tall trees and built in a style resembling early 1900s architecture, it could be on a European university campus. But the peaceful premises on a hectare of land are protected by electric fencing and security cameras and houses what could be described as a formidable crime-fighting unit: this is 25 Tambach Road, home to the Office of Interception Centres (OIC).
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