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
Police are appealing for information about a man who racially abused a 23-year-old woman and then began "throwing punches in her direction".
The conmen, including a former X Factor contestant, were sentenced for the 'heartless' scam, which preyed on vulnerable people.
Police are appealing for information about two sisters aged 12 and five who went missing three days ago.