A 23-year-old Topeka man was arrested Thursday after a struggle involving a knife outside of Walmart at 3300 Iowa. Employees had seen the man leave the building without paying for merchandise and tackled him after he tried to flee. The man then told the employees he had a gun, and tried to reach for something in his pocket. He was later found not to have a gun, but he did have a knife. Police officers were called to the scene shortly before 3:30 p.m. and arrested the man.