Johannesburg - Gauteng police were unable to confirm reports that an ex-Rwanda army chief was shot and critically wounded in an apparent assassination attempt on Saturday afternoon.
The BBC reported that a former Rwandan army chief of staff, Faustin Kayumba Nyamwasa, had been shot in Johannesburg at midday and taken to hospital in a critical condition.
"We are still trying to find out details," Colonel Eugene Opperman told Sapa.
"At the moment we don't know whether there was shooting or where and when it took place."
Nyamwasa's wife told the BBC that the couple had been returning from shopping when a gunman opened fire on their car.
She said it was an assassination attempt as there had been no demand for money or goods.
Nyamwasa, an outspoken critic of President Paul Kagame, fled from Kigali in February.
"He was shot in the stomach during the midday attack and is now undergoing surgery in a Johannesburg clinic," the BBC report said.
Mrs Nyamwasa said the gunman had shot at them until his gun jammed.
Nyamwasa had accused Kagame of corruption and claimed that the judiciary were compromised.
France and Spain are reported to have issued arrest warrants against Nyamwasa for his alleged role in the lead-up to and during the Rwandan genocide.