UPDATE: Dozens Feared Dead in Complex Terrorist Attack, Krasnogorsk, Moscow Oblast, Russia

Update (1538 EST): FSB has confirmed 40 dead, more than 100 wounded, according to TASS.

Update (1418 EST): Initial casualty numbers put at 40 killed, 100 injured by local Russian media. This has not been confirmed by authorities.

As this publication reported at 1330 EST, three armed gunmen entered the Crocus City Hall music venue in Krasnogorsk, Moscow Oblast, Russia. They began firing and several eyewitnesses reported several explosions as the gunmen fired on the crowd. As of this publication, a large fire has broken out at the popular music venue and emergency services are reporting that firefighters cannot reach the hundreds feared trapped inside. Emergency services have reportedly been instructed to wait for the arrival of special forces before entering the scene, local law enforcement is on scene.

As of 1337 EST, emergency services had received at least 12 fatally shot victims with at least 50 feared injured. Heavy gunfire can still be heard on scene.

The Crocus City Hall is a music venue administratively located in Krasnogorsk Urban Settlement (in the Krasnogorsky District (north-west to Moscow Ring Road). It is configurable into an auditorium, concert hall, and theater, with a maximum seating arrangement of 7,200 people.