DAYTON, Ohio -- A boy hanging out of an upstairs window tips off authorities to a potentially dangerous situation.

Firefighters were handing out batteries for smoke detectors Thursday night in the 100 block of South Hedges Street in Dayton when they spotted the four-year-old child. Investigators discovered that the boy was home alone -- living in a filthy house.

When crews asked the boy where his mother was, he said, "At the bar."

There was no food in the fridge and there were bugs everywhere in the home where the boy was found, according to the police report.

He and his eight-year-old brother are staying with their grandmother -- their mother was arrested and faces child endangering charges. The grandmother says the mother's boyfriend was watching the kids while the mother was gone.