Gunmen have attacked a concert hall on the fringes of Moscow, killing at least 40 people and wounding 100 more, Russian security services say.

At least four attackers clad in camouflage gear took part in the attack, in the north-west suburb of Krasnogorsk, BBC-verified video shows.

Crocus City Hall was about to host a rock concert when the gunmen burst into the foyer and then the theatre itself.

Much of the building was engulfed by fire and part of the roof collapsed.

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