Heavy sound in my city Today, at about 10am I was making my exercises in the classroom when a loud Bang ! happend. On the moment I though about a big steel bin was fallen. But all my school was shaken and the windows trembled. It was very scary, anybody in the classroom was speaking. After the course was finished, I'm gone on Facebook to know what's exactly happen. Some people did jokes, some other talked about explosion... It was very confusing. When media explained that was an aircraft exercise. And the sound was due to one of them which was flying over my city and pass through the sound wall. Few mimutes later this assumption was confirmed by the police. The sound was heard by inhabitant, kilometers around the citycenter.