A 13-year-old boy shot in north-west London was an innocent bystander, according to police.
The teenager was one of five people shot in the capital within 24 hours.
He was hit by shotgun pellets as he walked with his parents in Wealdstone High Street on Sunday.
Police believe two others were injured including a 15-year old boy who is in hospital with a head injury. A third victim was hit in the arm, but has not come forward.
The Met described the attack as "callous, reckless and brazen".
Wayne Bent, who was part of a group who helped treat the 13-year-old until an ambulance arrived, said: "There was lots of blood.
"The main area was the back of the head - it was just constantly bleeding."
The teenager was treated in hospital and has now been discharged.
Resident Jonathan Smith said he had "heard gunshots before" in the area.
He said: "I sometimes feel a little bit unsafe living around here. There's quite of lot of youths hanging around."