A fire broke out at a vacant house on Button Street in New Haven late Wednesday morning.
Crews responded to 87-89 Button Street and discovered a fire in the basement, according to New Haven Battalion Chief Tom Neville. It's unclear whether the fire started on the outside or the inside of the home, he said.
No one was home at the time of the fire, but Neville said it looks like someone may have been living at the address illegally on the third floor.
The fire marshal is investigating the fire and the cause is unknown.