Mysterious sounds from the sky. Can be heard all over the world!

For several weeks, in different parts of the world, you can hear the mysterious sounds. No one can accurately determine their origin.
Material gathered so far it shows that something is really on things. The authorities of some countries have already decided to investigate.
The case of strange sounds recorded in various parts of our planet is becoming more emotional.People who actually heard the sounds, describe it as frightening.
Witnesses have a problem with a clarification of exactly where they came from. Those who are trying to determine their similarity to known sounds believe they have the character `industrial`.
Among the emerging opinion is not missing those that suggest that the mysterious tones come from outer space.
There are also indications blaming the locals factory, however,it seems unlikely. Strange sounds that are recorded in various places in the world at the same time,and various factories in the world emit equally inharmonious sound also at the same time??
It seems that the anxiety accompanying the recent incidents more often reaches a peak of power. Officials of one of the resorts in Malaysia - a country which also managed to "capture" phenomenon - commissioned expertise, which is to clarify the matter. The command to address the employees received the National Space Agency. This means that the politicians are inclined to a variant, which indicates that the unusual audio signals from outer space.
Unidentified noises, except Malaysia, you could still hear in Hungary, the Czech Republic, Romania, Canada and the United States.
Does it mean, that Extraterrestrial try to contact us??