City police are investigating three robberies and robbery attempts in the downtown business district. The first crime involved a violent attack early Saturday on East Market Street near Lee Park. Police are searching for two African-American males in their 20′s who beat up a 51-year-old man while they were trying to rob him. There were two robberies that involved a single suspect Saturday night and early Sunday. A 21-year-old man was robbed of his cash at around 10:40 p.m. Saturday in the 100 block of West Jefferson Street. A little over two hours later, someone robbed a man and woman on 2nd Street N.E. and fled with their money and belongings. There were no injuries in the two most recent incidents. If you can provide more information, call Crime Stoppers at 977-4000.