The Zanesville Fire Department is investigating a fire this week. Assistant Chief Marty Mercer says it happened Sunday evening at 630 Spangler Drive and is considered suspicious. Mercer says the fire was contained to the inside of the home, but caused around 20-thousand dollars in damage. Mercer says fire crews were able to stop the fire, which had mostly burned itself out – with hand held fire extinguishers. The origin of the fire remains under investigation.