The Hawks believe two people, who were arrested in connection with an alleged 419 scam which targeted an American this week, were part of a bigger syndicate.
A 44-year-old Nigerian man and a 20-year-old South African woman were arrested in Sandton in northern Johannesburg on Friday for defrauding the US citizen of over R200,000.
The victim and the Nigerian met on an online professional network.
The American arrived in the country in March and gave the scammers over R200,000.
He alerted police on Wednesday when he became suspicious.
The two alleged fraudsters were charged with advance fee fraud and will appear in the Johannesburg Commercial Crimes Court soon.
Two suspected car snatchers were killed on Monday in Abuja when their stolen vehicle fell over a bridge and crashed into an empty residential building in Zuba in the Federal Capital Territory.
The suspects, allegedly snatched a Toyota Prado jeep and were trying to get away with it when the crash occurred. The suspects were on top speed when the driver lost control of the vehicle and fell from the bridge.
