Around 30 minutes later, in Siemens Street, about 5km from the fast food outlet scene, the gunman allegedly shot a man, believed to be in his 60s, in the head, Herbst said.
Gauteng police spokesperson Capt Kay Makhubele confirmed the 18-year-old had since died.
Makhubele said a second man, whose age is yet to be determined, had also died in hospital on Wednesday.
Makhubele said police are still trying to establish the identity of the gunman.
TimesLIVE