At least 40 people are dead and 100 others wounded after multiple gunmen attacked a concert hall in Moscow today, Russia‘s Federal Security Service reports. The Associated Press said authorities are investigating the incident as terrorism — the country’s worst in several years.

Photos and video from the scene show the Crocus City Hall engulfed in flames, and local officials said the roof was in danger of collapsing. The 6,000-capacity venue was hosting a concert by the popular Russian rock band Picnic.

The attack comes days after Russian President Vladimir Putin solidified his grip on power in what detractors said was a choreographed election. There was no immediate claim of responsibility for the assault, which was carried out by several people who spayed the hall with gunfire and set it ablaze.

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