Shippenville firefighters quickly brought a structure fire under control this afternoon at 8555 Main St., Shippenville. No injuries were immediately reported. The cause of the residential fire has not yet been determined. Firefighters from Knox and Clarion assisted. Route 322 was closed at the intersection with Route 208 while firefighters battled the blaze. Several wide-load tractor-trailers made traffic control challenging. Firefighters were still on the scene at 2:30 p.m.