US: Two workers at the Staker Parson cement plant, Tucson, Arizona, were exposed to cement powder when a silo malfunctioned and dumped the material onto them on 28 October 2013. When crews from the fire department arrived, their first priority was to decontaminate the employees by washing the cement powder off them using hoses.
Both men had respiratory complaints and one man had eye irritation. Both were taken to hospital for further treatment. Two other employees worked for one hour to plug the silo to keep the cement powder from continuing to leak out. They wore protective clothing, but also had to be decontaminated and were also taken to hospital for further evaluation.
All of the men were released from the hospital shortly after the incident.