A massive mushroom-shaped fireball erupted into the sky and sent flames soaring more than 1,000ft after a fuel wagon exploded on a train. The blast tore through a train on a war supply route in Russia's Tambov region following a derailment. The cause of the explosion was not immediately clear, but sabotage linked to the war in Ukraine was suspected. The affected train line carries heavy freight traffic and is critical for moving goods towards southern Russia , including fuel, equipment, and