Video from police body cameras shows officers entering the building during the fire and assisting with the rescues of residents. (The Fall River Police Department edited this footage.)

Investigators are looking into a number of issues including the possibility that the fire was caused by smoking near an oxygen tank.

The scene outside Gabriel House, the assisted living facility that saw a deadly fire over the weekend, was solemn Wednesday, as mourners placed flowers and lit candles, some praying, others standing silently, some imagining the scene over the weekend that left nine residents dead.

Police, fire, and EMS crews worked to rescue residents as smoke and flames spread through Gabriel House Assisted Living Facility in the heart of the city.

WBZ-TV 's I-Team has found Dennis Etzkorn, the owner of Gabriel House in Fall River, has legal controversies in his past.

Gabriel House residents described a chaotic scene Sunday night before they were rescued from the blaze that left nine dead and dozens more injured.