LINCOLN -- Lincoln Police are looking for the man who threatened convenience clerks with a knife during an overnight robbery. Capt. Michon Morrow tells KFOR NEWS the man walked into Casey's General Store at 40th and Adams late Tuesday night, demanding money from the safe and cash register. He's described as a light-skinned black man, 5-10 to 6 feet tall, 150 to 175 pounds. He wore a blue or black hoodie, black sweat pants and a black short sleeved shirt over a white long sleeved shirt. Meanwhile, just before 1:30am Wednesday a 24 year old Lincoln man walked into a Lincoln hospital with multiple stab wounds to his upper body. Capt. Morrow tells KFOR NEWS the man was immediately rushed into surgery, so investigators did not have a chance to talk with the man to find out how he was stabbed.