A 15-year-old boy was arrested Tuesday in connection with the armed robbery of a teenager in Evanston, police said.

The 15-year-old approached the teenager in an alley in the 1300 block of Dewey Avenue and showed a gun, police said. The 15-year-old demanded the teen turn over his bike and his cell phone, then hit him several times with the gun before fleeing the alley on the bike, police said.

Police responded to the robbery around 4:45 p.m. on Tuesday and were given a description of the robber, authorities said. Following a brief chase, officers found a 15-year-old matching the given description in the area near Crain Street and Dewey Avenue.

Police caught the 15-year-old, who was then positively identified by the other teenager, police said. Officers recovered the bike and the starter pistol used by the 15-year-old.

The Evanston teen was charged with aggravated robbery and will appear in juvenile court, police said.

The teenager who was attacked was not a Northwestern student, Evanston police Cmdr. Jay Parrott said.

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