Within hours (literally) the Egyptian authorities declared all sorts of things (distress call, recorders being decoded, no bomb, no missile).
I hope it's usual post-accident hassle, not any bad intent. Uncertain information, people who is not part of investigation speaking, multiplied by journalists and internet...
And given that ISIS urged a holy war against Russia just a couple of weeks ago
ISIS urged holy war against everybody so anything happening since they can propagate as their deeds.