Fire investigators are now investigating the cause of a fire that started in the attic of a Prosser butcher shop on Saturday afternoon. On Sunday morning, crews were still on scene monitoring the butcher shop and checking for hot spots. Scott Friend with West Benton Fire Rescue tells Action News crews were still putting water on the building at 4 a.m. on Sunday. According to West Benton Fire Rescue officials, the Underwood Prosser Lockers is a total loss. Fire officials say the Prosser Police Department has extensive damage while the Prosser City Hall building has moderate damages. Cooks Ace Hardware and Masonic Temple both have smoke and water damage according to West Benton Fire Rescue. Action News spoke with staff and the owner of the Underwood Prosser Lockers and they say they were at lunch when the fire broke out.