Waterloo Regional Police are looking into an assault reported in Uptown Waterloo.
Officers were called to a fight in the Dupont Street East and King Street North area around 3 a.m. on Thursday.
They said two groups were involved in the fight and an unknown male sprayed two victims with a noxious substance.
The victims received minor injuries.
Anyone with more information about the fight or the people involved is urged to call police at 519-570-9777 or Crime Stoppers at 1-800-222-8477.