Police are investigating an attempted robbery at the Safeway Pharmacy on West Arthur Street. A man armed with a knife approached the pharmacy counter just after 8:30 last night and demanded drugs. Officers say he appeared nervous and left the store without any prescription pills. The suspect is described as 5'8 to 6 feet tall with a thin build, scruffy appearance and no facial hair. He was wearing a grey baseball cap and a black windbreaker jacket.