WATCH: Early morning fire in Verdun

23 residents of a three-story apartment building at the intersection of Troy and Lasalle Boulevard in Verdun had to flee their homes in their bed clothes early Thursday morning after fire broke out in an upper floor apartment.

Firefighters responded to the first alarm shortly after 4 a.m. but it spread rapidly and three more alarms were sounded within the space of half an hour.

Montreal Fire Department spokesman David Shelton explained there were two injuries as a result of the fire, both minor.  "One person was transferred to hospital with second-degree burns to his hand," he said, adding that the other person refused treatment.

Some images from the aftermath of the apartment fire on LaSalle and Troy in Verdun. Firefighters have just told me that two people were injured. #CJAD pic.twitter.com/CsUSTCKHoo

— Benson H. Cook (@bensonhcook) 17 May 2018

All the residents have been accounted for but the damage to the building is extensive, with much of it concentrated on the top floor.  What appeared to be charred furniture was visible through the third-floor windows.

Montreal Police have just re-opened LaSalle Boulevard between Hickson and Wellington, after it was closed for much of the morning to facilitate the work being done by firefighters.

Périmètre rouvert à la circulation. ^RM #MtlCircul https://t.co/hZS4pB2uRS

— Police Montréal (@SPVM) 17 May 2018