According to focus magazine, the
Braunschweiger Bundesstelle für Flugunfalluntersuchung is investigating the possibility of sabotage in the downing of the Robinson. Wolfgang Haupt, 34, the owner , had received numerous death threats in the weeks before the crash. He was the owner of an IT company specialising in Artificial Intelligence and facial recognition.. Wreckage was strewn over a 200m radius and the BBF is investigating whether there could have been a deliberate explosion before the crash: walkers in the area report hearing a loud "bang".
https://www.focus.de/panorama/welt/i..._24373577.html