OTTAWA -- CTV News has learned three people are dead after a fire broke out overnight in the Britannia neighbourhood.

Firefighters were called to 127 Britannia Rd. at around 3 a.m. Monday. 

Three people had to be rescued from inside the home. Ottawa Paramedics told Newstalk 580 CFRA they were taken to the Queensway Carleton Hospital in critical condition.

Deputy Fire Chief Paul Hutt told CTV News at the scene the three victims have since died. 

The two-alarm fire was declared under control at 3:48 a.m.

The cause of the fire is under investigation. The Ontario Fire Marshall will be assisting in the investigation because of the tragic loss of life, Hutt said.

Ottawa Police say the arson unit has been called in to assist in the investigation. This is a routine step whenever people die in a fire.

Police say the victims are an 83-year-old woman, a 76-year-old man and a 49-year-old man.

Neighbours tell CTV Ottawa's Saron Fanel the victims were a husband and wife and their son.

Correction:

A previous version of this article said the fire was at 129 Britannia Road. A press release from Ottawa Fire had given an incorrect address.