One man was killed and another seriously injured after a wall collapsed Tuesday inside an office building on Tucson’s southwest side, authorities said. Tucson Fire Department officials said crews were called out about 10 a.m. and one victim was declared dead at the scene and the other was taken to a hospital with serious injuries. They said an interior wall collapsed and fell on top of the two men inside a Tucson engineering firm. The names and ages of the two men weren’t immediately released. State health and safety officials were investigating to see if any worker protection rules were broken in the fatal incident. Authorities said it’s unclear why a non-structural portion of the interior wall collapsed.