Huge ammunition explosion

You can see the mushroom cloud and then it takes nearly 5 minutes for the shockwave to reach

From desc"In the window saw the white mushroom. Ran out to the balcony.Appeared on the horizon 2nd mushroom, and a few minutes later came the sound wave. 8-10 minutes were heard infazvuk shock, car alarm went off. The building included a concern. In 5 minutes it left the library at OSU. We will wait for clarification in the press."