EMS and Fire Services from St. Stephen and Calais responding to the blaze around 6pm at 17 Pleasant Street in Milltown.
Sgt. Bob MacKnight of the District 1 RCMP says a mattress in one of the apartments was the cause of the fire.
He says tenants tried to remove the mattress but were overcome by smoke inhalation.
Two people suffered minor injuries from the smoke and were treated.
In total, nine people were left homeless and have been arranged temporary accomodations.
MacKnight says foul play is not suspected.
