(Portland, OR) -- An arson investigation is underway into a fire in a Bethany neighborhood that's still under construction. The fire ignited just after midnight yesterday morning near Northwest 169th Avenue and Catalpa Street, at a house being built by home builder Noyes Development. It's the fourth time in as many months that someone has set fire to a house being built by Noyes. Police believe a serial arsonist could be targeting the developer.