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Residents of Charleston, South Carolina and the surrounding towns of North Charleston, Mount Pleasant, and West Ashley were all startled by an
unexplained booming noise which shook windows and doors. The noise was reported on the morning of Friday, May 5th just after 8:30 a.m. While reports of the boom came in from all throughout the South Carolina Lowcountry, experts and law enforcement officials currently disagree about what the source of the sound might have been.
Minor earthquakes or other seismic activity were speculated to be the cause of the boom, but geophysicists reported
little seismic activity in the area at the time. There are also armed forces bases nearby, and aircraft exercises were cited as
the likely cause of a similar boom last year. However, military officials in the area claim that
they weren't behind the noise.
That does not rule out any classified or undisclosed testing, however. The Air Force's secretive
X-37B spacecraft
landed in Florida over the weekend, causing a sonic boom upon reentry. Could there have been another secret landing we don't yet know about?
Comment: See also: Strange sky sounds: Metallic, groaning, trumpet-like noises heard worldwide in 2016