A man is in hospital and Alberta's police watchdog is investigating after an officer-involved shooting at a southwest convenience store Friday night.

According to Calgary police, officers were called to the scene — a 7-Eleven located at 4604 37th Street S.W. — shortly after 8 p.m. for reports of a man inside acting erratically.

The man pulled a knife and people inside the store, believing they were in danger, called 911, police said.

EMS said three officers assessed at the scene for smoke inhalation. (Mike Symington/CBC)

Witnesses at the scene saw smoke emanating from inside the building. Fire crews and EMS also responded to the scene.

Police say officers contained the building, but when the situation escalated, an officer fired his gun at the man.

The man was transported to hospital. Police say his condition is serious, but his injuries are not life-threatening.

Three police officers were also assessed on scene for smoke inhalation, EMS said.

Fire, police and EMS responded to the 7-Eleven convenience store Friday evening. (Mike Symington/CBC)

The Alberta Serious Incident Response Team is conducting an investigation. Anyone with information is asked to contact Calgary police at 403-266-1234 or Crime Stoppers.