Gabriel Gundo, a Nigerian official, was travelling from OR Tambo International Airport to Sandton, where the summit is held, when he was stopped by men posing as police officers on Marlboro Drive on Wednesday night, said Gauteng police spokesperson Colonel Lungelo Dlamini.
It is believed the men who robbed Gundo were posing as police officers.
Dlamini said that South Africa’s Directorate for Priority Crime Investigation, known as Hawks, had taken over the investigation.
The 25th AU summit is being held at the Sandton Convention Center until June 15.
On May 22, several delegates attending the Pan African Parliament in Johannesburg were robbed at gunpoint in their shuttle bus at the entrance to the Protea Hotel Midrand.