Tulsa, Okla. — Tulsa police are investigating a holdup alarm at the S & K Food Mart. The store was robbed by a white male wearing a mask around 11 p.m. Sunday. He was wearing “a black coat with a hood on it as well as gloves,” TPD Sgt. Brett Bilyeu said. The man produced a shotgun and demanded money from the cash register. Witnesses say they saw three males running westbound from the scene. Police searched the area around East Apache Street and North Sheridan Road, but the suspects have not been located. No one was injured.