Nearly 800 Dayton Power and Light customers in Montgomery County lost power while crews battled a massive house fire on North Avenue in Dayton Friday morning. Firefighters were dispatched to the 700 block and found a two-story house fully engulfed in flames around 3:30 a.m., per initial reports. Both floors of the home were burning and flames were shooting through the windows, fire officials said.Crews worked to extinguish the blaze for over an hour due to the size of the house and water pressure issues.Neighbors say the house was vacant, though they believe squatters may have been occupying it.