One suspect is at large and one has been arrested in connection to an overnight shooting that left a police officer hospitalized.

Officer James McCullough remained in stable condition at Penn Presbyterian Medical Center on Monday morning after he was shot while stopping a car theft in progress on Sunday night, 6ABC reported.

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Around 8:50 p.m. on Sunday, McCullough, 24, was on patrol with his partner when a woman flagged them down near Salford and Market streets, NBC10 stated. She indicated that two men were breaking into her car.

When the officers approached the vehicle, two men exited and ran from the scene, 6ABC added. McCullough tackled one of the suspects and was subsequently shot in his thigh at close range.

One of the suspects in the incident has been taken into custody, but the alleged shooter remained at large on Monday morning, Fox29 reported.

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Police Commissioner Richard Ross said authorities have "some idea" about the identity of the at-large suspect, according to NBC10.