Updated:A building collapse killed six people Tuesday and injured 20 more. The building had been under construction when it collapsed on 35 construction workers at the site. Four men have been pulled from the rubble and walked away, but five people remain unaccounted for. Emergency rescue workers on the scene used rescue dogs to help locate those missing while onlookers watched in silence. The building had been a two-story edifice in the final stage of construction when it collapsed.