TRENDING: Motorcyclist dies following Clearcreek Twp. crash
The spill could have caused some issues for aquatic animals, however no significant warnings have been issued for the general public, Bristow said.
The Ohio EPA also is investigating the incident.
UPDATE @ 2:44 a.m. (June 10)
The source of an oil spill reported in the Great Miami River Friday night is still unknown, according to Montgomery County dispatchers.
Dispatchers said crews reported most of the oil in the river was west of the Paul Laurence Dunbar Bridge.
Crews cleared the scene just before midnight without finding the source of the spill.
INITIAL REPORT (June 9)
The Dayton Fire Department responded tonight to a report of an oil slick in the Great Miami River.
Crews are trying to track the source of the oil, and a hazardous materials team was called, Montgomery County Regional Dispatch confirmed.
A passerby reported the oil slick, according to dispatch.
We will update this report as we learn details.