The detained are suspected of channelling funds and providing weapons to the gunmen who attacked the concert hall in Moscow.
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Russia's top security agency has broken up a so-called "terrorist cell" in southern Russia whose members were allegedly involved in the Moscow concert hall attack.
The Federal Security Service said that it detained four suspected members of the cell in the Russian province of Dagestan in the North Caucasus.
The agency alleged that the suspects detained in Dagestan were involved in channelling funds and providing weapons to the gunmen who attacked the concert hall on Moscow's western edge on March 22.
“The detained militants directly participated in financing the perpetrators of the March 22 terror attack on the Crocus City Hall in Moscow and providing them with terror means,” the FSB said in a statement.
It said one of the suspects detained in Dagestan had confessed to personally bringing weapons to the Moscow attackers.
The FSB released a video showing one of the suspects saying that they also planned an attack in the city of Kaspiysk in Dagestan. It wasn’t clear whether the two confessions came from the same person.
The agency said the suspects are foreign nationals, without specifying their nationality. The suspected attackers of the Moscow concert hall arrested hours after the March 22 raid are citizens of Tajikistan.
The detention of four suspects in Dagestan follows the arrest of the four suspected gunmen and seven others who were accused of involvement in the attack.