CHICAGO (CBS)–A man and a woman were carjacked by a man with a gun as they walked into The Patio, a restaurant in south suburban Orland Park, Thursday morning setting off a chain of events that ended with a foot chase and the suspect running over a police officer.

The offender, described as a black man in his early 20’s, approached the victims on foot in a parking lot on the 7800 block of 159th Street in Orland Park around 12 p.m., according to police. He showed them a handgun and demanded their belongings, including the keys to their 2016 Dodge Charger.

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According to Oak Forest police, the suspect headed eastbound on 159th Street at a high rate of speed, striking a construction worker as he turned northbound on Cicero Avenue.

With police in pursuit, he ditched the stolen Charger and ran away on foot.

Next, he carjacked a white Mazda and ran over a police officer who was chasing him. The officer fired his gun at the suspect as he fled in the stolen car, according to police.

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The suspect had not been caught as of Thursday evening.

The officer was treated at a nearby hospital for his injuries and has since been released, police said.

The construction worker was listed in stable condition at Christ Advocate Hospital.

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Police in Oak Forest and Orland Park are conducting a joint investigation.