There are multiple reports of a loud explosion or “sonic boom” heard across southern Cullman County and stretching to northeastern Jefferson County.

No word yet on what exactly caused the sound, but The Times will post an update as soon as possible. The Cullman County Sheriff’s Office said it has received widespread reports of the sound Tuesday afternoon.

The U.S. Geological Survey shows no sign of an earthquake.

Birmingham meteorologist James Spann weighed in on Twitter:

“Bama Boom” heard around 1:45 felt strongly across much of Jefferson, Blount, Walker, Cullman, Talladega, Clay, Winston, and St. Clair counties. No explanation from NWS or EMA; awaiting word from NASA if they have any idea. Stay tuned.

— James Spann (@spann) November 14, 2017

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From the National Weather Service in Birmingham:

Re: loud boom heard: we do not see anything indicating large fire/smoke on radar or satellite; nothing on USGS indicating an earthquake. We don’t have an answer, and can only hypothesize with you. 1) sonic boom from aircraft; 2) meteorite w/ current Leonid shower?

— NWS Birmingham (@NWSBirmingham) November 14, 2017