Kennewick police are investigating a possible arson that damaged several tables and chairs stored behind a building in Kennewick Thursday morning. Kennewick police said they believe a fire was intentionally set in the back alley of the 100 block of W. Kennewick Avenue. The fire damaged several tables and chairs that were being stored in the area. The fire did threaten the building but Kennewick firefighters were able to quickly put out the fire.