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In his message, the Uzbek President Shavkat Mirziyoyev conveyed sincere words of deep sympathy to the relatives and friends of the victims and the injured persons.
The blast on Monday hit the St Petersburg train as it travelled between stations at about 2.20pm local time. Another bomb was found in another train.
According to latest data, 10 people died from the blast and 43 others were taken to hospital.