Two men and a teenage boy were injured when a shotgun was fired twice into a minicab they were sitting in.
They were waiting in the vehicle on Gordon Road in Edmonton, north London, at 18:00 GMT on Saturday when another car pulled up alongside them.
At least two men got out of that vehicle then approached the minicab and fired a shotgun twice into it.
Police said the minicab driver, 22, and his two passengers, aged 22 and 16, were all hurt in the shooting.
One passenger's injuries were described as "potentially life-changing".
No arrests have been made over the attack, which is being investigated by the Met's Trident and Area Crime Command.