Long time readers of this site, and more importantly, Gates of Vienna, may remember this very interesting story that both sites followed very closely in 2014 and 2015 and posted many links as the story progressed.
In summary, a building blew up that housed Islamic centres and related businesses and residences, and instead of investigating as the local PD said they would do, the feds came in and literally swept up all the evidence after inventing a lie to explain the explosion that the local gas company invited the media in to their offices to disprove.
Of course, since this story was first published entire video hosting platforms have come and gone, and we were one of the first to be Winston Smithed from Youtube a couple of years ago now. So the videos were removed.
So what we can know is, in true Orwellian fashion, investigative agencies hide evidence and invent causes.
Here are the videos I have been able to restore so far: