Russia has charged four men it says attacked a Moscow concert hall and killed at least 137 people.

Three were marched blindfolded into a Moscow court. A fourth appeared in a wheelchair. All were charged with committing an act of terrorism.

The Islamic State group, or IS, said it carried out Friday's atrocity at Crocus City Hall, and posted video which appeared to support the claim.

The accused were named as Dalerdzhon Mirzoyev, Saidakrami Murodali Rachabalizoda, Shamsidin Fariduni and Muhammadsobir Fayzov. Masked police brought them into Basmanny district court in the Russian capital. All the men appeared to be injured.

Russian officials have claimed that Ukraine was involved in the attack without producing any evidence. Kyiv said the claim was "absurd".

Tina Daheley presents BBC News at Ten reporting by Steve Rosenberg and Frank Gardner.

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