The Taliban, who control Afghanistan, have strongly condemned the terrorist attack near Moscow at an event venue that Russian officials say killed at least 115 and injured more than 100 others.
Unidentified men wearing camouflage clothing stormed the Crocus City Hall event centre in north-west Moscow shortly before the start of a concert in the suburb of Krasnogorsk and opened fire on the crowd on Friday, according to Russian reports.
The extremist militia Islamic State claimed responsibility for the attack on one of its channels.
Authorities in Russia said on Saturday that 11 arrests had been made following the attack.
On Saturday, Abdul Qahar Balkhi, the Taliban foreign ministry spokesman, wrote on X, formerly Twitter, that a "coordinated, clear and resolute stance" by the countries in the region against terror is needed.
Balkhi described IS as a group "in the hands of intelligence agencies aimed at defaming Islam and posing a threat to the entire region."
Islamic State is also active with a regional branch in the border region between Afghanistan and Pakistan.
The militia is in conflict with the Islamist Taliban, who promised security when they took power again two and a half years ago.
In an agreement with the United States, the Taliban pledged that there would no longer be a terrorist threat from Afghan soil.