UPDATE TUESDAY -- The fire was intentionally set, according to Wilkes-Barre fire officials.
WILKES-BARRE -- Fire damaged three houses in Luzerne County Monday morning.
It broke out before 11 a.m. in the 300 block of Blackman Street in Wilkes-Barre.
The fire chief said two houses were on fire when they arrived. One was vacant and investigators are checking to see if anyone lived in the other house.
Siding on a third home was also damaged.
No one was hurt.
Investigators have not determined the cause.