https://www.zeit.de/news/2018-06/13/verdaechtige-substanzen-gefunden-festnahmen-in-koeln-180613-99-697887
Check out the pic at the link.
https://youtu.be/feDdrHj-jkQ
Video from scene at link above. People in PPE at the scene. Doesn’t look like they’re worried about explosives, more like chemical or biological.