Fire crews responded to a reported chemical spill at the Mayo Clinic research building in northeast Scottsdale on Wednesday night. Crews were called to the clinic after a lab tech reported an odor coming from a packing container that holds broken vials inside the building, at 13200 E. Shea Blvd., Scottsdale fire officials said. Six employees were evacuated from the lab. One was evaluated but refused transportation to a hospital, officials said. The Scottsdale Fire Department's hazardous-materials team conducted testing of the air inside the lab but found no evidence of contaminants, officials said. None of the surrounding businesses or neighborhoods was evacuated. Nearly 60 firefighters from the Mesa and Phoenix fire departments responded to the incident.