GRAND RAPIDS TOWNSHIP, Mich. (WOOD) — Authorities are trying to determine the source of a bullet that hit a vehicle on I-96 near Grand Rapids Monday.

It happened around 4:30 a.m. on eastbound I-96 near Cascade Road in Grand Rapids Township.

Investigators believe a single bullet struck the driver’s door as the vehicle was heading east on I-96, according to a Michigan State Police news release. Police recovered a spent round in the car and are working to determine exactly where the shot was fired from. The driver was not injured, police say.

A sergeant with the MSP post in Rockford told 24 Hour News 8 they do not believe Monday’s shooting is connected to a drive-by shooting that injured a driver in Kentwood a day earlier.

MSP said there’s no reason to believe the driver was targeted. In fact, they’re still trying to determine whether someone intentionally fired shots at the highway or a stray bullet accidentally struck the car.

Anyone with information in this case is asked to call the Michigan State Police Rockford Post at 616.866.4411.