FRANKLIN COUNTY, Mo. (KMOX) – If you heard what sounded like an explosion around 4:30 p.m. on Thursday, you’re not alone.

The Franklin County Sheriff’s Department received numerous calls and on its Facebook page, attributed it to a sonic boom. A sonic boom occurs when a plane travels faster than the speed of sound.

Some commenters weren’t convinced, alleging a government cover-up.

(Courtesy of Franklin County Sheriff's Department Facebook page/Facebook)

(Courtesy of Franklin County Sheriff’s Department Facebook page/Facebook)

The Sheriff’s Department says it will post an update if the noise was caused by something other than a sonic boom.

(TM and Copyright 2016 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2016 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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