Charleston, West Virginia -- Dozens of people called 911 after hearing what sounded like an explosion Tuesday night in Kanawha County.

The loud sound was heard at approximately 5:30 p.m. Metro 911 dispatchers said they called local agencies and no emergencies were reported. There were no reports of gas line ruptures and no seismic activity was observed, either.

Many callers described the sound as thunder or an aircraft's sonic boom. Dispatchers said the source of the sound is a mystery.