Two people were killed and five injured in the explosion, which officials say was caused by 'gas contamination' of the plant's equipment though it is unclear whether this was an accident or whether it was sabotaged.Two more explosions hit Russian airbases at Saratov and Ryazan, damaging nuclear-capable bombers being used for attacks on Ukrainian power stations.Lyubov Volokitina, a Siberian local commenting on today's explosion, said: 'My husband got up, went downstairs, poured himself a coffee and looked out the window to see the Christmas tree in our yard, which we decorated yesterday.Olesya, a local woman posted: 'I live at the end of Novo-Lenino area, and at 6am I woke up from my bed rocking.Read moreMore From Daily Mail- Paul Pogba mocks Weston McKennie's patriotic red, white & blue haircutDaily Mail- Liverpool players pictured riding camels during warm weather campDaily Mail- National Archives releases more than 13,000 classified files related to JFK's assassinationDaily Mail"