Proof that the crime is not only directed against Nigerian visitors:
From News24
Ex-Miss Thailand robbed in Jhb
2007-12-6 12:40
Johannesburg - Police on Thursday were hunting for the bogus "policemen" who allegedly robbed a former Miss Thailand and her entourage on their way to open a Thai temple in Johannesburg of more than R60 000. The group of 30 Thai tourists arrived at OR Tambo International Airport in Johannesburg on November 10, and were en route to the foundation-laying ceremony of the Wat Buddha Johannesburg temple.
Note: Interesting, this and many robberies are committed by bogus policemen. Unless caught and arrested - how will/do they know they were bogus policemen?