Gates, N.Y. - A Gates teen previously charged with robbery was picked up by police again last night.

Gates police say they arrested 17-year-old Keith Speed after a brief foot chase that led them through two backyards. The officers were on a routine patrol when they approached Speed while he was riding his bike. 

Speed was arrested for robbing a pharmacy and several gas stations in Gates. In each incident, police say Speed pulled out a gun on cashier each time. Investigators say that gun turned out to be a BB gun.