MOSCOW (Reuters) -A spot check on Angara Airlines, which operated the Antonov An-24 plane which crashed in Russia's far east on Thursday killing all 48 on board, had uncovered serious safety violations a month beforehand, the Izvestia news outlet reported on Friday. Russia's transport ministry said on Friday that aviation and transport regulators would investigate the privately-owned Angara's activities to check if it is complying with federal aviation rules before taking a decision about its future. Citing documents it had seen from Russia's airline and transport regulators, Izvestia said that transport safety inspectors had carried out a spot check on Angara in June which had uncovered concerns related to the servicing of its planes.