FRESNO, Calif. (KSEE/KGPE) - Fire investigators are working to identify possible suspects responsible for setting a vacant house on fire in Fresno Wednesday morning. According to Fresno Fire, just before 4:30 a.m. they responded to a fire on a vacant two-story home on Wilson Avenue near Olive Avenue. Firefighters say upon arrival they found heavy smoke and flames coming from the second story which they were able to quickly contain before it spread. Fire investigators determined the cause of the fire was a result of arson and are working to identify any potential suspects. Anyone with information is asked to contact the Fresno Fire Department at 559-621-2767.