Residents of the Longfellow neighborhood in Minneapolis have been reporting loud, unexplained explosions for several decades. The booms mostly occur on summer nights and have been described as "house-shakingly loud" and low-pitched, distinct from a car crash or gunshot.
In 2010, the Minneapolis Police Department's Third Precinct said that while fireworks and exploding electrical transformers could account for half the noises, "the rest were unexplained." — Read the rest
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