CHICAGO (CBS) — At least five people were in custody Wednesday afternoon in west suburban Aurora, after someone allegedly fired shots at police, and the officers returned fire, hitting a suspect in the leg.

Aurora police said undercover officers in three unmarked cars were conducting surveillance of two vehicles for suspected gang activity in the 900 block of Grove Street in Aurora at 10:50 a.m., when someone inside one of the vehicles opened fire on the officers.

Officers in two of the unmarked vehicles returned fire, and one suspect was shot in the leg, police said.

One suspect vehicle tried to flee the scene, but crashed into a pole, and all four men inside were arrested.

The second suspect vehicle also sped away, but police caught up about a block away, according to police. One man in the vehicle was arrested, but the other fled on foot and got away.

Police said a gun was recovered from one of the vehicles.

The suspect who was shot was taken to the hospital. Another suspect who was injured in the crash also was hospitalized. Officials said both were under police guard Wednesday afternoon.

No officers were injured.

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