By "working idea" do you mean something that you made up in your head which has no basis in reality, but works for you?
Edit: I had only seen the one post on X in which responsibility for the attack was claimed when I made this comment, but looking at the account further they do make many politically motivated comments.
With this new insight my comment now seems unnecessarily dismissive because it's not completely unreasonable to suspect false flag attacks when political motivations are being broadcast. To be clear I'm not making any assumptions for this specific case one way or the other, but I am acknowledging that the political speech presented by the attackers does add some merit to your suspicion.
