Lexington County, SC (WIS) - Residents of Red Bank in Lexington County appear to have gotten a loud awakening Thursday morning as multiple reports indicate a loud booming noise in the area.

WIS News 10 viewers poured onto our Facebook page this morning to report the sound.

"What was the horrific boom in the Redbank area," asked Lisa Russell Fields. "People are saying it sounded like a plane crash or explosion."

"I also heard the "big boom" this morning. So did a lot of other people, it sounds like a close cannon or something and will shake the whole building/house," said Jennifer Lee Stokes Kleine.

"Does anyone have a concrete explanation for the loud boom that shook houses in Lexington County around the Redbank/YMCA/Old Barnwell Road area this morning around 8:30 a.m.," said Mary Frances Henry Bell.

So, what was it? The Lexington County Sheriff's Department doesn't know either.

"Law enforcement officers and public safety personnel have been unable so far to determine the source of the noise," said Sheriff's Department spokesman Maj. John Allard. "No explosions have been reported."

A similarly loud explosive noise happened last year in the South Congaree portion of Lexington County.

Residents reported then being woken up to the boom around 8 a.m. on a Sunday. Seismographs at the University of South Carolina even measured something in the area.

However, there was never any cause determined for that loud noise either.