Yakima Police have made an arrest in the May 4th robbery at the Tieton Food Mart at 4708 Tieton Drive. Authorities say the 24-year-old suspect was in custody in the Yakima County jail on a unrelated charge when he was arrested on the robbery charge. Police say the suspect walked into the store armed with a silver revolver and demanded cash from the clerk. They say he stole hundreds of dollars and ran from the store after threatening the clerk and a customer who was inside the store a the time of the robbery.