Lawrence police are searching for a suspect who robbed 23rd Street Liquor, 945 E. 23rd St., just after 10:30 p.m. Monday night.According to police, the man walked in and flashed the barrel of a gun. The clerk on duty handed the man an undisclosed amount of cash, then called the police.The suspect fled the store east on foot, police say. Security camera video captured images of a man about 6-feet-tall, weighing about 160 pounds, wearing blue jeans, a tan coat with a hood and sunglasses. As of Tuesday morning, the suspect was still at large.Police are asking anyone with information about the robbery to call 8443-TIPS, an anonymous tips hotline.