Police say anyone who witnessed the shooting, or has any information should contact detectives on 0208 358 0200, or Crimestoppers anonymously on 0800 555 111.
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They tried to drive off, pursued by the suspect on foot, before their car crashed into a fence.
"Three were standing together almost shoulder-to-shoulder in like a little wolf pack and they're staring at me...", said PC Wayne Marques.