Salem Fire crews responded to a blaze last night at the old Givens Book Store at corner of East Main Street and North Electric Road. When they arrived on scene, authorities found flames coming out of the building and the roof had fallen in. No one was believed to be in the building at the time of fire. There is no word on a possible cause.Just before 11 p.m., a bulldozer came and began demolishing the building. It was scheduled for demolition as part of a renovation project on that corner.