Sioux Falls police are investigating an overnight armed robbery at a casino. 

It happened just after ten-thirty last night at the Neon Casino on East Tenth. 

A man wearing a ski mask pulled a knife and took money from the clerk, before taking off. 

Police are looking for a white man in his late-twenties to early thirties, about five-foot-nine and 160-pounds with shoulder-length blond hair. 

He was wearing a dark-colored shirt and blue jeans.
 
Anyone with information should call Crimestoppers at 367-7000.