Fitchburg police are looking for suspects following reports of shots fired Monday night.
Officers went to the area of Thurston Lane and Rosenberry Road just before midnight.
That's where witnesses reported hearing gun shots and two vehicles apparently chasing one another.
One car has been described as dark in color; the other silver, possibly a Hyundai Sonata.
Police found shell casings at the scene.
No one was reported injured, and no damage has been found.