CHICAGO (CBS) — Chicago police officers shot a man while responding to a robbery call at a gas station Sunday night in the West Humboldt Park neighborhood.

Police received a 911 call about an armed robbery at a Citgo gas station at Cicero Avenue and Augusta Boulevard shortly before 9 p.m.

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Employees at the station said it was a clerk who called police. He was able to do that, because he works behind the counter in an area surrounded by bulletproof glass.

That didn’t stop the robber from trying to hold up the station, and to make matters worse, police were not far away when the clerk called 911. At least two officers arrived as the holdup was still going on.

“Officers were actually working a block away, responded to the gas station, and observed a male attempted to rob the gas station. As officers approached, an encounter ensues between the offender and the officers. Officers open fire. The offender is wounded, shot once in the leg, transported to Stroger Hospital in serious but stable condition,” Chicago Police Department spokesman Anthony Guglielmi said.

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No officers were wounded, according to Guglielmi.

“Detectives currently are on scene interviewing the employees of the gas station, and working the criminal investigation,” he said.

Area North detectives were investigating the robbery. The Independent Police Review Authority was investigating the police-involved shooting. The officers involved would be placed on administrative duties for 30 days while IPRA investigates.

Police said a gun was recovered at the scene.

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The police officers were not wearing body cameras at the time. Gas station employees said the robbery was caught on surveillance video, but so far the station and police have not released any footage.