Strange sounds, described as similar to thunder or an earthquake, have been unsettling the residents of Clintonville, Wisconsin for two straight nights. Officials are baffled about the cause, but say the strange noises are for real.
Offering no explanation to worried locals, activities like construction and "fracking" have been investigated. So far, no cause has been found for disturbing the late-night sleep of thousands of people who have flooded 911 with emergency calls, ranging from reporting earthquakes to UFO sightings.
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