An employee of Cross Town Tavern told police Saturday that a man walked up to the front door of the business holding a handgun.Police were called to the bar at 1910 Haskell Ave., early Saturday in response to a complaint of a fight outside possibly involving weapons. The employee said that two unidentified men had a fight inside, and one of the men got kicked out. When that man tried to re-enter the bar with the handgun, the employee locked the door and told another employee to call the police.The incident is still under investigation.¢ Police responded to three charges of discharging a firearm over the weekend – one resulting in police confiscating a handgun.Police responded to two incidents Saturday night where several residents heard gunshots. One was along the 700 block of East 13th Street, the other along the 1600 block of East 18th Street.Earlier Saturday, police responded to the 500 block of Fireside Drive, where they issued a citation to a 24-year-old Lawrence man for discharging a firearm within city limits. At the scene, police found a Kimar 911 blank-firing pistol, a Smith and Wesson .357 revolver and one .38 caliber shell casing.