A man is in police custody after a fire broke out at an Orléans townhouse and a woman was stabbed.

Multiple 911 calls came in just before 7:40 a.m. on Sunday, reporting fire and smoke at a townhouse complex at 3275 St. Joseph Blvd., according to Ottawa Fire Services.

Firefighters rescued two people from the two-alarm fire: an unconscious man suffering from serious smoke inhalation and a woman suffering from stab wounds.

john mcgetrick ottawa police

A man is in custody after a Sunday morning fire at a townhouse on St. Joseph Boulevard, said Insp. John McGetrick of the Ottawa Police Service. (CBC)

The man was taken to the Ross Tilley Burn Centre in Toronto for specialized treatment and is in police custody, police said. The woman's injuries were not life-threatening.

A firefighter was injured while trying to bring the blaze under control, the fire department said.

Shortly after 10:30 a.m., Ottawa police confirmed the fire was being investigated as a crime. The fire was brought under control shortly before 11:30 a.m.

About 30 residents were displaced by the fire, said Ottawa police Insp. John McGetrick.

St. Joseph Boulevard was closed from Tenth Line Road to Prestone Drive and has since reopened.

McGetrick said it could be some time before police are able to piece together what happened at the townhouse Sunday morning.

"Investigations like this are long and complex, and it takes a long time to sort through — especially when they involve folks who are injured," McGetrick said.