Ten people have been hospitalised after shots were fired in the Moss Side area of Manchester.
Greater Manchester Police said most of the injuries did not appear to be life-threatening.
Police were called to the incident in Claremont Road at about 02:30 on Sunday.
Several people were in the area following the Caribbean Carnival, which had finished some hours before, the force said.
Det Sup Debbie Dooley said: “We currently have a number of people in hospital all being treated for different injuries, but thankfully most do not appear to be life-threatening at this time.
“Officers are trying to establish exactly where this incident took place and who is responsible for such a dangerous attack.”
Extra officers will be patrolling the area over the coming days to reassure the public, she added.