At least 40 people have been killed, and that some attackers have barricaded themselves inside.
A large fire has engulfed the roof of the complex
Russian special forces have been deployed to the scene
The White House says it is working to find out more about the situation but that there is “no indication at this time” that Ukraine is involved. More than 70 ambulance teams are attending to the sight of the attack, the governor of the Moscow region reported.