London police are investigating a suspicious fire inside a three-storey building on King Edward Avenue.
In an update Thursday afternoon, police say one occupant is in hospital, listed in serious condition.
Emergency crews responded to the area at roughly 4:30 p.m. Wednesday.
Platoon chief Gary Mosburger previously told Global News most of the residents had evacuated by the time they arrived at the scene, except for one person with mobility issues.
He says they were able to shelter the person in place until they could evacuate them from the structure.
“We used a mask system with an air tank to protect the airway for that individual while we were able to get the extrication process completed,” Mosburger said.
It was “a rather ingenious move by our crews to give the individual the safety they required to get them out,” he added.
The resident was treated at the scene by paramedics before being taken to hospital where police say they are listed in serious condition.
Police say multiple units were impacted by the fire, but a damage estimate is not yet available.
— with files from Global News’ Jacquelyn LeBel.