A man and boy are dead, and a woman is in critical condition, after what appears to be a triple shooting in a townhouse complex in Surrey, B.C., east of Vancouver.

Cpl. Dale Carr from the Integrated Homicide Investigation Team says police responded to a home in the 6300-block of 126th St. 11:00 a.m. Sunday morning and found the two bodies, including that of a boy between the age of 11 to 14.

A badly injured woman was transported by Medivac helicopter to Royal Columbian Hospital in New Westminster with life-threatening injuries. She remains in critical condition.

Carr says investigators still aren't sure what prompted the deaths.

In Pictures: Surrey, B.C., double homicide

Heavily armed officers arrested one man inside the home, but police still aren't sure what role, if any, he may have played in the deaths.

"He was at the home, and was promptly arrested by Surrey RCMP," Carr said.

"We're being abundantly cautious and not implicating that male as being responsible."

Police would not confirm the suspect may have called 911 himself.

"We received a call, the specific nature of who called and what called in my view forms evidence that will be presented later in court," RCMP Supt. Wayne Rideout said.

Carr said the man in custody was not charged and would be questioned by investigators Sunday night.

It is also unclear what the relationship is between the man and boy who were killed, and the woman who was injured.

"It's certainly way too earlier to indicate whether or not there's any link to drugs, gangs, organized crime," Carr said.

"We're also looking at whether this has a domestic link to it."

Neighbours speaking to CTV News say a woman with two teenage sons lives in the home. The family recently moved to Canada from India.

Investigation underway

Rideout says police are in the preliminary stages of their investigation, and are trying to find out exactly how the victims died.

A bullet hole is visible in one of the home's third-floor windows and officers at the scene could be seen picking up what appear to be shell casings around the property.

"There was a report of shots fired so we're acting on that premise but we haven't been inside close enough to the bodies to conclusively say that they've been shot," Carr said.

The area around the home has been secured by Mounties, but police need to secure a search warrant before entering the home to continue their investigation.

"Once we've done that, forensic teams can move in and begin to start their evidence collection," Carr said.

Police are expected to work through the night.