All four gunmen who carried out a deadly attack that killed at least 133 people and injured 140 at a packed concert venue in Moscow, have been arrested.
Authorities say 11 people were detained in total, and the four gunmen were caught while heading to Ukraine.
The Islamic State (IS) group says it was behind the attack.
On Saturday, IS-linked news agency Amaq shared on Telegram an image of the four masked men they claimed were involved in the assault.
Russia has not commented on the Islamic State’s claim.
In a televised address, Russia’s President Putin condemned the massacre - the deadliest in Russia for nearly 20 years - as a "barbaric terrorist act" and repeated earlier suggestions by Russian security services that the attackers had tried to escape to Ukraine.
Kyiv dismissed the claim that it was in some way involved in the attack.
Source: BBC News
