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
Elena Veronica Ciochina left her home in Newham on Saturday night and hasn't been seen since.
The internet's favourite grumpy feline has flown over from the US to take in the sights of London but looks less than impressed.
Nero jumped a fence in Watford which had a 12-foot drop the other side.