MOSCOW, Aug 23 (Reuters) - A senior Russian prosecutor said nationalists were the most likely culprits in a bombing which derailed a train travelling from Moscow to St. Petersburg on Aug 13, Interfax news agency reported on Thursday.

"The most serious (line of inquiry) is a terrorist attack by nationalist youth groups from Moscow or St Petersburg," First Deputy Prosecutor-General Alexander Bastrykin said in an interview to be published in Rossiisskaya Gazeta on Friday, Interfax reported.

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