Youngstown firefighters are working to piece together how a vacant house caught on fire twice early Wednesday morning.

At the 300 block of Ravenwood in Youngstown, the porch of a vacant house caught on fire just after midnight. 

Authorities say they had the fire out within minutes.

Then, around 5 am firefighters were called back out to the same house. 

No injuries have been reported, no one was in the house either time. 

Crews had the second fire out quickly and are trying to find out what caused both fires.