People lay flowers at a spontaneous memorial in memory of the victims of Moscow attack in St. Petersburg, Russia, Sunday, 24 March, 2024.

Video. WATCH: Flowers and rubble as Russia reels from Moscow concert attack

Set against rubble and twisted metal, mourners brought tributes to the Moscow concert hall on Sunday following a terror attack that killed more than 130 people.

Set against rubble and twisted metal, mourners brought tributes to the Moscow concert hall on Sunday following a terror attack that killed more than 130 people.