A 17-year-old who was shot by police investigating a robbery at a Pickering, Ont., vet clinic was carrying an imitation weapon, according to charges announced Wednesday.

The suspect, who cannot be named due to his age, remains in a Toronto hospital in serious but stable condition after at least one police officer opened fire outside a local veterinary clinic on Monday.

Durham Regional Police say officers arrived at the Sheridan Veterinary Services and confronted a lone male suspect outside of the building. Police say the suspect was shot during the confrontation.

One witness told CTV Toronto that two officers “emptied their guns” after confronting a suspect outside the building.

Other witnesses said there were about five shots in total, coming in quick succession at first and then slowly near the end.

Ontario’s Special Investigations Unit is probing the shooting and is asking witnesses to call 416-622-1935.

Durham Regional Police have charged the teen with robbery using an imitation weapon, wearing a disguise with intent to commit a crime and possessing a dangerous weapon.