MOSCOW, April 1. /TASS/. The Russian Foreign Ministry is unaware if Iran had alerted Russia to a major security threat ahead of the Crocus City Hall terrorist attack, Russian Special Presidential Representative for Afghanistan Zamir Kabulov told TASS.

"I know nothing of this kind [of tip]," the Russian diplomat said, commenting on a Reuters report alleging that Iran had tipped off Russia about a possible terrorist attack.

On the evening of March 22, a terrorist attack targeted the music venue in Krasnogorsk, Moscow Region, just outside the Moscow city limits. According to the latest data, 144 people have died, and 551 others have been injured.

All four gunmen have been apprehended, while five others are believed to have aided them, according to investigators. The Russian Investigative Committee said the perpetrators had links with Ukrainian nationalists.