MOSCOW, April 5. /TASS/. Russia’s Investigative Committee is looking into the involvement of Islamic terrorists and Ukrainian intelligence agencies in the Crocus City Hall attack, the top investigative body said in a statement.

"Investigative and operational activities are underway regarding the involvement of members of Ukrainian intelligence agencies and international Islamic terrorist organizations in plotting and financing the terrorist attack," the statement reads.

On the evening of March 22, a terrorist attack targeted the Crocus City Hall music venue in Krasnogorsk, Moscow Region, just outside the Moscow city limits. According to the latest data, 144 people were killed and 551 people suffered injuries. Ten people, including four direct perpetrators, have been arrested for their part in the terrorist attack. The Russian Investigative Committee said that investigators had found evidence of the perpetrators’ connection to Ukrainian nationalists.