ANDERSON — Investigators continued to examine the scene at Second and Sycamore streets Wednesday after fire tore through a block-long building at Hayden Transit System, destroying the structure and at least four vehicles parked near it. The overnight blaze gutted the building and melted aluminum siding on nearby houses. Anderson firefighters arrived at the scene just after 10 p.m. Tuesday to find the building fully involved, with flames shooting through the roof. “There was nothing we could really do but protect the outlying structures and contain the fire,” Anderson Fire Chief Dave Cravens said. “My guys worked very long and very hard, and I thought they did an excellent job.”