WEST ALLIS, Wis. (CBS 58) The West Allis Police Department is investigating an armed robbery near 91st and Greenfield.

Police say that a suspect entered a building near 91st and Greenfield around 6 p.m. on Tuesday.

Preliminary investigation reveals that a suspect had a knife but did not display it during the robbery.

The only suspect information available at this time is that it was a male, wearing jeans, a dark hoodie, and a mask. 

West Allis Police continue to search for the suspect.

Stay with CBS 58 News for more information on this developing story.