A Lake Success police officer shot a suspect in a cellphone store robbery three times during an attempted carjacking later that evening, authorities said Friday.

The suspect was shot twice in a leg and once in the right torso -- all non-life-threatening injuries, said Lake Success Police Chief Joseph Gardella.

The unidentified man was taken to a hospital and placed in federal custody because the FBI has joined Nassau detectives in the investigation, said Gardella and Nassau County Insp. Kenneth Lack, a police spokesman.

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Gardella said the suspect was unconscious but in stable condition Friday. Arraignment had not been scheduled.

The suspect, armed with a gun, robbed a T-Mobile store in Flower Hill at 6:20 p.m. Wednesday and fled in a vehicle, Lack said.

The vehicle was abandoned by the Lakeville Road overpass of the Long Island Expressway in Lake Success, authorities said.

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Police began searching the area, and Gardella said tracks in the snow led officers to the suspect.

"Two of our officers came upon the subject in one of the side streets in the village. They told him to stop, and he continued to run from them," the chief said.

The chase ended back on Lakeville Road, where Officer Richard Petrillo drove up to join the two officers and saw the attempted carjacking, Gardella said.

"There was a violent felony in progress, and they were trying to disrupt that felony," Gardella said.

The chief said Petrillo fired three times; the other officers did not fire. The motorist wasn't injured, according to Nassau police.

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Nassau homicide detectives are investigating the shooting.

Petrillo, who remains on full duty, is a former NYPD officer who has been with Lake Success for 14 years. "He is an exemplary officer here," Gardella said.

Lack and Gardella declined to release the suspect's name, possible charges, carjacking details and other information, citing the ongoing investigation.

New York FBI spokesman Chris Sinos confirmed the bureau is investigating to see if federal charges can be filed. He declined to comment further.