There is no verified information or credible reports of a mass shooting with over 100 deaths at a Moscow concert as of my last knowledge update in early 2023. It is important to refer to official sources or trusted media outlets for the most accurate and up-to-date information on such events. If there were to be an incident of this nature, it would likely be widely reported by international news agencies and would have significant implications for public safety and security measures in Russia. Always verify information through reliable channels before sharing or acting upon news regarding violent incidents.
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