Firefighters in Warren are working to determine what caused a fire early Monday inside a vacant house on the northeast side of the city.

Flames broke out about 1 a.m. at a house located at the corner of Vine Avenue and Scott Street. 

Firefighters say flames were coming from the house when they arrived. The fire was contained to the living room, which sustained the bulk of the damage. 

No injuries were reported. 

The cause of the fire right now is undetermined.