One person was taken to the hospital after fire broke out on the first floor of a home on McKinley Avenue in Norwich and 10 people have been displaced.
First responders found the man unconscious when they responded on Thursday morning and he is being treated for smoke inhalation.
Nine adults and a child have been displaced.
A neighbor said she tried to help, but all the windows and doors were locked, so she and another neighbor broke a window.
Several pets were also in the home.
The American Red Cross is working with the victims.
The cause of the fire is under investigation.