12/03/2014 05:11 EST | Updated 02/02/2015 05:59 EST

Kensington Market fire on Oxford Street was arson, police say

The major fire that destroyed three Kensington Market row houses has been deemed an arson, and one resident thinks she may have caught the alleged perpetrator in the act on video.

Toronto police have launched an investigation into the case, officials confirmed Wednesday, after the Ontario Fire Marshal determined the fire was deliberately set. Police said they had no information to release about the case at this time.

But surveillance video of an alleyway behind Oxford Street shows a man emerging from darkness moments after the fire starts. Then, the man returns, apparently carrying an armload of material (possibly stacks of cardboard boxes from a nearby business), which he deposits on the fire. The blaze grows.  

The fire started around 1 a.m. on Monday, quickly becoming a 4-alarm fire as it tore through a row house complex on Oxford Street. It took 110 firefighters to put it out.

Three people were left homeless after the blaze, and it's believed that several pets were killed.

Investigators canvassed the area for any footage that would help the investigation, and it turned out there is plenty.

One neighbour even turned the battle to control the blaze into a high-definition time-lapse that you can see below, or, at by clicking here if you’re on mobile.