SPOKANE, Wash. -

Spokane Police and FBI are investigating an apparent improvised explosive device that went off underneath a parked car at the 5800 block of North Monroe early Saturday morning.

Neighbors from two houses away claim they heard an explosion at 4:30 AM.

There were no injuries resulting from the explosion. The vehicle the device was placed under, as well as surrounding vehicles, suffered damage.

There are no suspects at this point. Officers say this look like an isolated incident.