"According to our experts, a homemade explosive device equivalent to 1 kilogram of TNT went off onboard, which caused the plane to break up in the air, which explains why the fuselage was scattered over such a large territory. I can certainly say that this was a terrorist act," Alexander Bortnikov said.

All 224 people on board, most of them Russian tourists, were killed in the October 31 crash.

Putin vowed to hunt down those responsible for the attack. "There's no statute of limitations for this, we need to know all of their names," Putin said. "We're going to look for them everywhere wherever they are hiding. We will find them in any place on Earth and punish them”, he added.

ISIS has claimed responsibility for bringing the Russian plane down in written statements, as well as video and audio messages posted on the Internet following the crash.
It said the attack was retaliation for Russia's air campaign against ISIS - and other groups - in Syria, where Moscow wants to preserve the rule of President Bashar Assad.

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