A fire inside a multi-family home in Providence that displaced four families was started by a 7-year-old who firefighters say was left home alone. Crews responded to the house on Hudson Street just before 5:30 Thursday night and found smoke coming from the third floor. They say a child in that apartment lit a candle, accidentally setting a couch on fire. The 7-year-old had been pulled to safety by some neighbors who saw the child knocking on the window. The child and two neighbors were taken to the hospital and treated for possible smoke inhalation. They are expected to be okay. Firefighters say DCYF was notified about the incident and is now investigating. The Red Cross, meanwhile, is working with the displaced families to find them temporary shelter.