NEW HAVEN, Conn. (WTNH) — Firefighters are on the scene of a fire on Blatchley Avenue early Sunday evening.

According to New Haven Fire Department, the fire was at a residence at 266 Blatchley Avenue.

The Fire Department tweeted out that the fire had been upgraded to a two alarm fire.

Officials believe the fire began in a vacant multi-family home. The fire caused the roof to collapse.

One firefighter was taken to the hospital, but is expected to be okay. 11 adults and seven children have been displaced. The Red Cross is on the scene assisting.

Investigators are trying to determine what started the fire.News 8 will update this story as details become available.