It will be a while before it's pieced together. At present, Russian transport minister Maksim Sokolov dismissed the ISIS claims. He said: 'This information cannot be considered accurate. We are in close contact with our Egyptian colleagues and aviation authorities in the country. They have no information that would confirm such insinuations.'
Military experts dismissed claims that ISIS would have been able to 'shoot down' the jet from cruising altitude using a surface-to-air missile, however, an on-board bomb could be a possibility.
Read more: dailymail.co.uk
If an on board bomb, or surface to air attack is indeed the case, you can count on TSHTF.