Was it terrorism?
Isil in Egypt have claimed responsibility for the crash on social media, but most experts doubt the terror group has the sophisticated weapons required for such an attack. Egyptian and Russian officials have expressed scepticism about the Isil claim that it downed the plane.
Some aviation experts believe Isil may have placed a bomb on the plane or sabotaged it in some way, but others say it is too early to tell if the tragedy was the result of a terror attack. Reports from Russia suggest there may have been technical problems with the plane, but the investigation is still in its preliminary phase, so it is hard to know the exact cause of the crash.
