Christchurch police say a man at the centre of an Armed Offenders Squad callout was shooting at a can in his backyard.
Police were called after three or four shots were heard from the property in the semi rural Styx Mill/Highsted Rd area shortly before 10am on Saturday.
Officers cordoned off the area and stopped a 27-year-old man as he was leaving the property by car.
Sergeant Jason Stewart says the man, who has a firearms license, is cooperating with them and they haven't decided whether charges will be laid.
He says a shotgun and a .22 rifle were found at the property.
Sergeant Stewart says there are houses near the property so police treated the incident seriously.