About an hour and a half ago from the look of it.
The assault did not appear to be planned, but rather began with scattered fire that quickly erupted to a crescendo, punctuated by more blasts. Dozens of hostages — many barely dressed, their faces strained with fear and exhaustion – survived the assault, but others emerged bloodied and in shock. The fate of the majority inside — now believed to be as many as 1,000 — was not immediately known.
Update: What Interfax is reporting is not a pretty picture. Unplanned raid, over 200 wounded, surviving terrorists hiding out in an adjacent building.