Fire and Several Audible Explosions Near kurfürstenstraße

Starting around 08:30 local time I heard an initial explosion and took the first picture of this building. The initial explosion was followed by 3 to 4 additional explosions of different size, with the shockwave of the largest being felt at my location. For reference, the picture was taken with 5x zoom. I can't find any details yet on what has happened, but sirens have been heading toward the area all morning. I believe I heard some sirens before the blast, possibly indicating a fire had started before the first explosion, but I didn't realize the event was taking place until I was startled by the first loud explosion. Update: 09:18 - The smoke is decreasing rapidly, and there have been no further explosions. It does appear the fire fighting teams are struggling to get water higher into the building with the equipment that has currently arrived at the scene. I have not witnessed any air support for the fire. Currently the seem to be limited to ...