02/23/2015 10:25 EST | Updated 04/25/2015 05:59 EDT

Gatineau twins in weekend apartment fire die in hospital

Twelve-year-old twins who were unconscious when firefighters carried them out of a burning apartment building in Gatineau, Que., have died in hospital, the mother of the boy and girl has told Radio-Canada.

Gabrielle and Jacob Rondeau were asleep when their 17-year-old brother left them alone in the apartment on Marengere Road to get pizza with his girlfriend, he told Radio-Canada. 

Daniel Rondeau said firefighters were battling smoke and flames when he returned around 11 p.m. ET.

The twins were unconscious when they were rescued from their second-floor apartment.

The fire started in the kitchen, the Gatineau fire department said. 

More than 20 people were forced out of the four-unit building during the fire.