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The RIA-Novosti news service said 385 miners were underground on Saturday in the Zasyadko mine in Donetsk when the mine experienced a methane blast.
No deaths were reported in the Saturday accident that injured 44 workers.
According to the Associated Press four rescue workers at the site were killed on Sunday in a second methane blast.
One hundred miners died at the mine in a methane gas explosion on November 18 in the country's worst mining accident post Soviet rule.
