Inexplicable phenomenon has been observed in several States.
The last few weeks, residents of the state can hear strange sounds coming from nowhere. Local authorities have tried to clarify the situation themselves, but in the end decided to get the FBI involved.
About the strange explosions have already stated more than a hundred residents. Problem gaining mass, reported officials of the Philadelphia. Yet no one can tell the nature of the sounds.
According to some assumptions, the noise could be the result of sonic booms, the construction of an underground tunnel of plate tectonics or other processes.
It is worth noting that Pennsylvania is the last region of the long list, which was was a phenomenon. Earlier strange sounds heard in Colorado, Maryland, South Dakota and other territories. Perhaps the situation will become clear after some time.
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