The agency received a call from a driver around 5:25 p.m. who claimed an egg had been thrown on her windshield by a passing vehicle.
The incident occurred on State Road 129 near Delaware.
Dispatchers received several additional calls alleging eggs and rocks had been throwing at cars.
The events took place from S.R. 129 and Highway 48, S.R. 229 in the Ballstown area outside of Batesville, and Finks Road outside of Napoleon.
Officers were unable to track down a vehicle or suspect.
Investigators are asking anyone with information to call the Ripley County Sheriff’s Office at (812) 689-5555.