Police are appealing for information on two men seen running away from the scene of the shooting on Hindrey Road, towards the nearby Pembury Estate.
One is black, officers said, while the second is light-skinned, possibly of Asian or Turkish appearance.
Police said there was as yet no clear motive for the shootings, and no-one has been arrested.
"At this very early stage we must retain an open mind regarding the circumstances of the incident and any motive," the spokesman said.
More top news
Reverend Simon Harvey from Islington lost his wife Jennifer to a sudden illness nine weeks ago.
Drivers will be forced to charge reasonable fares under plans to ensure tourists are not targeted by drivers trying to take advantage.
Robbie is Britain's first official bionic hound, after having his back legs strengthened with a state-of-the-art exoskeleton.