A Westbrook woman injured late Friday in a fire at her apartment building is being treated for life-threatening burns at a Boston hospital.

Madelena DuDu Kassa, 51, was taken to Maine Medical Center in Portland by ambulance and then flown by LifeFlight helicopter to a Boston hospital shortly after the 10 p.m. fire Friday.

She was still in critical condition Saturday night, according to Maine State Police spokesman Stephen McCausland.

Earlier in the day Saturday, Westbrook Fire Chief Andrew Turcotte said the fire started on the stove inside the first-floor apartment at 94 Pierce St. That’s where Kassa lived with her husband, James Kassa, and their two adult children, Cliff, 30, and Emanual, 22, none of whom was injured.

A family of six who lived on the second floor of the apartment building was displaced by the fire as well. Three of them – Shymma Abdaullah, 37, Alak Abduallah, 13, and Abdullah Abduallah, 30 – suffered smoke inhalation but all were treated at a local hospital and released, McCausland said.

The fire destroyed the apartment building. The American Red Cross is helping the displaced residents find alternative accommodations.

McCausland said smoke alarms did go off inside the second-floor apartment but investigators are still trying to determine if alarms on the first floor went off.

The building is owned by Memana Abraham of South Portland.

Staff Writer Beth Quimby contributed to this story.