Russia has accused four individuals of carrying out an assault that killed at least 137 people in a music hall in Moscow.
Four were in wheelchairs and three were marched into a Moscow court, bent double. They were all accused of carrying out terrorist acts.
The Islamic State organisation, or IS, released video footage and claimed responsibility for the outburst that occurred outside Crocus City Hall on Friday.
Without providing any proof, Russian officials have asserted that Ukraine was involved. The assertion is deemed "absurd" by Kiev.
