The attack in Moscow, Putin says all four suspects were arrested after 133 killed in the concert hall.

Russian President Vladimir Putin said all four armed men who carried out a deadly attack in a country full of concerts in Moscow have been arrested.

At least 133 people were killed and more than 140 injured when the attackers entered the building, shooting indiscriminately and burning it.

Authorities said 11 people were arrested in all, and four armed men were caught on their way to Ukraine.

The Islamic State Group (IS) says it stands behind the attack. On Saturday, Amak, the IS channel in Telegram, posted an image of four masked men they claimed were involved in the attack. Russia has not commented on the IS claim.

In a televised address, Putin condemned the massacre -- the most deadly in Russia for nearly 20 years -- as a subx0-mbarous terrorist “and repeated earlier suggestions by Russian security services that the attackers had tried to flee to Ukraine.

Kiev dismissed the claim that it was somehow involved in the attack as “absurd”, the BBC writes.