When we heard the first shots around 8:20am, we thought it was someone dropping tables in the atrium, and a few seconds later we heard another round of gunfire. Still not convinced that it was gunfire, we went to investigate.
2:21 We heard a round of extremely loud pops. We had no idea what it was or where it was coming from. The class was in complete silence and we all stared at each other in immediate fear. Within a second we heard it again. We all immediately ran.