An 11-year-old girl and her mother were injured when a gunman opened fire at a house, Scotland Yard said.
The shooting happened in Cricklewood, north west London, at around 9.40pm yesterday.
The victims were taken to hospital - the girl with a gunshot wound to the foot and her 48-year-old mother with injuries to her leg and chest - and are not in a life-threatening condition.
Scotland Yard said four other adults who were in the house at the time were unhurt.
Two black men were seen running away after the shooting, which is being investigated by the Met's Trident Gang Crime Command.
Detective Inspector Glenn Butler said: "This incident occurred in a residential area, which may have led to a number of people seeing what occurred.
"If you saw anything unusual within Chelsea Crescent and the surrounding roads, then please contact the incident room. The motive for this incident remains unclear but I am keeping an open mind as to all possibilities."