A loud boom heard across Blount, Sevier, Cocke, and Knox counties in Tennessee around 1:30 p.m. on Tuesday remains unexplained, with multiple agencies, including the Blount County Sheriff’s Office, investigating.

Residents reported the noise, sparking theories on social media about causes like earthquakes, sonic booms, or dynamite. Local quarries denied recent explosions, and similar mysterious booms have been reported nationwide, from New York to Georgia, without clear answers.