Marshon D. Knox, 21, of Zion.

A Zion man has been charged with robbing someone at gunpoint in the parking lot of the Warren-Newport Library in Gurnee during an arranged meetup Friday morning, police said.

Marshon D. Knox, 21, of Zion, was charged with armed robbery, a Class X felony, and unlawful use of a weapon, a Class 3 felony.

The Gurnee Police Department responded around 11:30 a.m. Friday to the Warren-Newport Public Library, 224 O’Plaine Road in Gurnee, for a report of an armed robbery.

Officers arrived and learned the victim was attempting to sell a cellphone through an online marketplace app, Gurnee Police Spokeswoman Shawn Gaylor said.

“The two made arrangements to meet at a local parking lot for the exchange. The suspect displayed a handgun, took the cellphone, and ran toward a nearby apartment complex,” Gaylor said.

Officers established a perimeter around the area and requested assistance from the Lake County Sheriff’s Office K-9 Team, which tracked the suspect, later identified as Knox, to an apartment within the complex.

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When officers attempted to make contact with Knox at the apartment, he jumped from a second-story window and fled the scene on foot, Gaylor said.

The K-9 team and officers caught and arrested Knox without further incident. The weapon believed to have been used during the robbery was located by police.

Court proceedings and bond information was not immediately available Friday evening regarding the case.