Feb. 2 (UPI) -- A Russian drone strike in Ukraine's southeastern Dnipropetrovsk region has killed at least 12 miners and injured eight more, according to officials who are accusing the Kremlin of attacking unarmed civilians. DTEK Group, Ukraine's largest private energy company, said a Russian drone struck a bus transporting staff from its Dnipropetrovsk mine, resulting in at least 20 casualties. "The bus was hit as it was taking miners home after their shift," the company said in a statement.