A 15-year-old Chicago resident was arrested on Tuesday in connection with aggravated robbery of a 13-year-old boy in south Evanston, according to a news release.

A school resource officer noticed the 13-year-old in the 1000 block of Elmwood Avenue on Tuesday afternoon looked upset and asked him what had happened, the release said. The boy told the officer another male came up behind him, brandished a gun and demanded the boy give him a speaker attached to his bag.

Police located the 15-year-old in the 1400 block of Oak Avenue, the release said. When detectives pulled over to speak to him, he fled and subsequently fell to the ground, tossing what appeared to be a gun under a vehicle.

According to the release, after taking the boy into custody, the officers found that the gun was actually a BB gun that closely resembled a real gun. The 15-year-old was petitioned to juvenile court for felony aggravated robbery, the release said.

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