MOSCOW (NEWSnet/AP) — Russia President Vladimir Putin vowed Tuesday to find masterminds behind the attack at Crocus City Hall in Moscow.

The incident left 144 dead, the worst assault on Russian soil in two decades.

Speaking at a meeting with officials from Ministry of the Interior, Putin said it is important to determine "not only the perpetrators of this outrage, but all links in the chain and its beneficiaries.”

He added, in an apparent threat of retaliation: “Those who use this weapon against Russia should realize it's a double-edged weapon.”

Putin also urged law enforcement agencies to tighten security at mass gatherings.

Putin said perpetrators of the raid sought to “sow discord and panic, strife and hatred in our country in order to break up Russia from within … we mustn't allow them to do that.”

Russia security agencies have detained four suspects, all of them citizens of Tajikistan, and seven other alleged accomplices.

Putin urged the Interior Ministry to tighten control on illegal migration and close loopholes in procedures that allow people with a criminal past to obtain work permits and Russia citizenship.

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