Many people felt and heard a large boom in Blount County and authorities are still working to determine what caused it.

The Blount County Sheriff’s Office says they received several calls after the boom was heard at around 1:30 p.m. yesterday afternoon (Tuesday).

While thousands of people were without power after the boom, Blount County deputies patrolled the area for blown transformers and City of Alcoa officials say it was not electric-related.

Maryville Police Chief Tony Crisp said no injuries have been reported.

TDOT and Vulcan Materials were not blasting at the time the boom was reported.