CLARKSVILLE, TN (CLARKSVILLE NOW) – Residents from Sango to Old Russellville Pike, even out to Woodlawn, had a “what was that” moment Saturday night after a “boom” shook the ground, but as of Sunday morning it remained a mystery.

At about 9:50 p.m., the 911 Dispatch Center received numerous calls about a “loud explosion” being heard, and several people reported they felt the “ground shake,” according to a notice from Clarksville Police.

Residents speculated it could have been anything from a vehicle wreck to an earthquake, and some reported seeing a flash. There have been no reports of injuries or property damage.

The Clarksville Police Department, Fire Department, Montgomery County Sheriff’s Office and Emergency Medical Services searched for a couple of hours but were unable to locate the source, the CPD notice said.

Fort Campbell is on a four-day weekend due to the Labor Day holiday, and does not appear to be conducting any type of training or exercise.

“Currently, this seems to be some sort of unknown phenomena until someone reports actual damage,” the notice said.