MOSCOW, March 23. /TASS/. Intelligence agencies have detained four suspects in the Crocus City Hall terrorist attack in the Bryansk Region, the Russian Investigative Committee said in a statement.

"Intelligence agencies have detained four of the suspects in a terrorist attack on the Crocus City Hall concert venue in the Bryansk Region, not far from the Ukrainian border," the statement reads.

Federal Security Service (FSB) Director Alexander Bortnikov has reported to President Vladimir Putin on the detention of 11 people, including four terrorists.

The attack killed 93 people.