Authorities said gunmen opened fire at a rock event in a Moscow suburb Friday, killing at least 40, wounded 100, and starting a theater fire.

Moscow mayor Sergei Sobyanin canceled all public activities for the weekend, citing a "terrible tragedy" during the Russian rock band Piknik's performance.

A period of fifteen to twenty minutes was spent with those who were in the hall being brought to the ground in order to shield themselves from the firing.

The US president termed the incident "terrible" but denied a connection to the Ukraine war.

A theater in Moscow known as the Dobrovka was the location where Chechen separatist gunmen held 912 people captive in 2002. They demanded that Russian soldiers depart from the area.

Russia's foreign ministry spokesperson Maria Zakharova called it a "bloody terrorist attack".

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