MOSCOW (AP) 鈥 One year since the Moscow concert hall attack killed 145 people, Russian officials asserted Saturday that it was planned and organized by "the special services of an unfriendly state.鈥

The aim, according to a a statement by Svetlana Petrenko, the representative of the Russian Investigative Committee, was to "destabilize the situation in Russia.鈥

Though she did not specify the 鈥渦nfriendly state,鈥 she noted that 鈥渟ix Central Asians鈥 currently outside of Russia had been charged in absentia and placed on Russia鈥檚 wanted list for allegedly recruiting and organizing the training of four of the suspected perpetrators.

The four men, all of whom were identified in the media as citizens of Tajikistan, at the end of March last year on terrorism charges and showed signs of severe beatings. One appeared to be barely conscious during the hearing.

According to Petrenko, 19 people are currently in custody in Russia in relation to the attack on Moscow's Crocus City Hall.

A faction of the Islamic State group has claimed responsibility for the massacre in which gunmen shot people who were waiting for a show by a popular rock band and then set the building on fire. But Russian officials including President have persistently claimed, without presenting evidence, that Ukraine had a role in the attack. Kyiv has vehemently denied any involvement.

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