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Reports started coming in around 8 last night regarding a disturbing noise heard in the Highland Park area, according to cbs2. Described by some as "an explosion" or a "loud boom" coming from approximately North Ave 52 and Monte Vista Street, authorities went out into the neighborhood to try to determine what produced a sound that was heard by those at a fire station to residents a half-mile away. "20 firefighters have combed the area looking for anything out of the ordinary, but have come up empty." Guesses as to what made the noise range from a loud backfire to a meteorite. The unusually loud noise, however, remains a mystery.