Homemade, Heavy, Bomb Brought Down Russian Jet, Russian Officials Say

Putin is vowing to track down those responsible.

— -- The bomb that Russian officials said had been planted in a Russian jet by terrorists was extremely heavy, according to a new analysis.

Russian officials said an analysis of the plane and customer baggage revealed evidence of the explosive device. The plane crashed over Egypt’s Sinai Peninsula on Oct. 31 with 224 passengers on board.

Alexander Bortnikov, the head of the Russian Federal Security Service, called the bomb "a homemade explosive device with an equivalent of 1 kilogram of TNT."

The explosion led to the plane "'breaking up' in midair," Bortnikov said, "which would explain the scattering of the plane’s fuselage [main body] across a wide area."

"We will not wipe tears from our heart and soul. This will remain with us forever," Putin said today. "But this will not prevent us from finding and punishing the criminals. We must do that without an expiration date, we must know them by name. We will find them everywhere, where they have hidden themselves. We will find them at any point on the planet and we will take retribution."

Putin said Russia's military and aerial work in Syria "should be strengthened so that the criminals understand that retribution is unavoidable."

Russia is offering a $50 million reward for information on those responsible.

"We have some instinct about what might have happened" but the info is "not conclusive," Kerry added.

Egyptian officials said they will take Russia's findings "into consideration."