Fort Wayne police are investigating an armed robbery that happened shortly after 5:00 Monday morning at the Ricker's gas station at South Anthony and Tillman in Fort Wayne.  Officers are looking for a black male who went into the business and showed a handgun.  He was wearing dark clothing with a black and white hat and had a scar on his face.  Once he got what he was after, he jumped in a black Toyota and headed eastbound on Tillman.