An investigation is underway into a shooting involving a Chicago police officer that left a man wounded in the Hermosa neighborhood Thursday night, officials said tonight.

At about 8:30 p.m. Thursday, police responded to a call of shots fired in an alley on the 2200 block of North Keystone Avenue, police said. When they arrived officers noticed a car running with the motor running and with shell casings on the ground, police said.

They noticed a door to a nearby garage was open and saw a man crouching inside, police said.

When an officer entered the garage and announced that he was police, a man lunged at the officer while holding a shiny metallic object in his hand, police said. The officer fired his weapon and struck the man, police said.

Police found narcotics on the man, who was taken to an area hospital.

Officials from the Independent Police Review Authority were notified about the shooting at about 9 p.m. Thursday and are conducting an investigation, said IPRA spokesman Mark Smith.

The man sustained non-life-threatening injuries in the shooting, Smith said. Police did not say if a weapon was found.

csadovi@tribune.com