Explosion INSIDE cabin brought down Russian passenger jet over Egypt US infrared pic shows

http://www.express.co.uk/news/world/616032/ISIS-Russian-jet-Egypt-Terror-Monitor-jihadis-claim-responsibility

It follows an executive at the Metrojet airline ruling out pilot error or a technical fault as responsible and saying an external factor brought the plane down at Sinai.
The US satellite does not show the heat flash moving as a missile would but is instead a single burst from inside the plane.
The latest information from the variety of sources suggests a bomb was planted onboard the aircraft.
ISIS previously released a chilling video purportedly showing jihadis shooting down the Russian plane, though it has not been verified.
Russian authorities had denied terrorists were behind the tragedy, and say it was due to a plane fault.
But yesterday a Metrojet official, Alexander Smirnov, ruled out technical issues or pilot error saying it was due to "an external impact on the plane".