The United States Embassy in Moscow sent out a security alert in advance of the attack to avoid large crowds, specifically concerts.<ref>[https://ru.usembassy.gov/security-alert-avoid-large-gatherings-over-the-next-48-hours/ Security Alert: Avoid Large Gatherings over the Next 48 Hours]. United States Embassy & Consulates in Russia, March 7, 2024. ru.usembassy.gov</ref> | The United States Embassy in Moscow sent out a security alert in advance of the attack to avoid large crowds, specifically concerts.<ref>[https://ru.usembassy.gov/security-alert-avoid-large-gatherings-over-the-next-48-hours/ Security Alert: Avoid Large Gatherings over the Next 48 Hours]. United States Embassy & Consulates in Russia, March 7, 2024. ru.usembassy.gov</ref> |