QUINCY – Police say they've not yet decided whether to file charges against a 28-year-old man who admitted firing two rounds at another driver during a road-rage confrontation on Kenderick Avenue on Tuesday evening.

Sgt. Karyn Barkas said the driver with the gun was still in the area when police responded to a report of gunshots around 7:30 p.m. Tuesday and admitted that he was the one who fired them, telling officers that he only did it because the other driver came at him with a knife. Barkas said police have not yet located the second driver, who had left the area by the time police arrived.

Barkas said the confrontation came out of some kind of perceived slight as the two drivers were heading up High Street from Washington Street in Braintree. She said police got a call from a woman on Kendrick Avenue who said she heard a man's voice in her yard followed by what sounded like gunshots.

Barkas said the driver with the gun told police that the other driver had pulled up in front of him, stopped suddenly and come out of his car with a large knife. Police searched the area and found two spent shell casings.

Barkas said police have no indication that the second driver was hit by the shots. She said Quincy police put out a bulletin asking other departments in the area to keep an eye out for anyone showing up at a hospital with gunshot wounds and had not heard of anything as of this morning.

Barkas said the driver had a valid license to carry a firearm. She said the license was confiscated along with any guns he had.

The shooting, which remains under investigation, was the second in Quincy in less than a week. On Friday, two defendants were arrested after a shot was fired in Quincy Center during what a prosecutor described as a botched attempt to rob a marijuana seller. No one was hit in that incident either.