A huge explosion has badly damaged a key oil refinery in far eastern Russia in just the latest mystery blast to hit the country's infrastructure.The blast struck Angarsk Oil Refinery, near the Siberian city of Irkutsk, around 5.50am local time Thursday - lighting up the early morning sky with a fireball. 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.
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