A Russian court has remanded an eighth suspect in custody over the attack on a Moscow concert hall that killed at least 139 people, officials said.
Moscow earlier announced it had detained 11 people in connection with the attack, which saw camouflaged gunmen open fire at people at a concert in Crocus City Hall and set the building on fire.
Russian State media said the latest suspect is a man from Kyrgyzstan.
Officials said he was ordered to be held in detention until at least May 22, without detailing the exact accusations against him.
Four men charged on Sunday with carrying out the attack are citizens of Tajikistan.
Three more suspects — reportedly from the same family and including at least one Russian citizen — were charged on terror-related offences on Monday.
It is the worst such attack on Moscow in over two decades and was claimed by the Islamic State group on Friday.
President Vladimir Putin on Monday acknowledged for the first time that “radical Islamists” were behind the attack, but suggested they were linked to Ukraine somehow.
Ukraine has described accusations it was involved as absurd.
