This is the best summary I could come up with:

Russian news reports said that the assailants also used explosives, causing a massive blaze at the Crocus City Hall on the western edge of Moscow.

Video posted on social media showed huge plumes of black smoke rising over the building.

Russia’s state RIA Novosti news agency reported that at least three people in combat fatigues fired weapons.

Extended rounds of gunfire could be heard on multiple videos posted by Russian media and Telegram channels.

Another one showed a man inside the auditorium, saying the assailants set it on fire, with incessant gunshots ringing out in the background.

Andrei Vorobyov, the governor of the Moscow region, said he was heading to the area and set up a task force to deal with the damage.

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