An elderly woman is dead and four other people are in hospital after a fire broke out in a Newmarket, Ont., seniors' residence Sunday afternoon.

A remote smoke alarm alerted firefighters to the apartment building at 468 Eagle St. shortly after noon. Crews were met by heavy smoke and flames coming from a seventh floor unit.

According to Platoon Chief Art Bellar of Central York Fire Services, six trucks and 27 firefighters were dispatched to the building. Crews managed to quickly knock down the flames and fully contained the fire about 45 minutes after arriving.

Inside the unit, firefighters found the body of a woman, believed to be in her 70s, who had died of injuries caused by the blaze. Police are currently working to notify her next of kin, York regional police Const. Laura Nicolle said.

Newmarket seniors' home fire

Several hundred residents were safely evacuated from the 14-storey building and transported to a nearby community centre. (CBC)

Four other seniors were transported to hospital for "very mild smoke inhalation", while several others were treated by paramedics at the scene. 

Several hundred residents were safely evacuated from the building and taken to a nearby community centre. They are expected to be back in their homes by Sunday evening, Bellar said. 

The Ontario Fire Marshal is investigating what may have caused the fire, but Nicolle said it is not being treated by police as suspicious.