A teenage boy has been arrested on suspicion of spraying people with a homemade chilli liquid, police have said.
A youth has been arrested on suspicion of attempting to cause grievous bodily harm and administering a noxious substance, and remains in police custody.
Ten people, including the youngster, complained of stinging or itchy eyes following the incident at the Costco superstore in Avonmouth, Bristol, on Monday evening.
Store staff gave first aid treatment until ambulance crews arrived along with police officers and firefighters.
Those targeted responded well to treatment and were discharged at the scene, Avon and Somerset Police said.
