Again, this is hard for the Dish to confirm. But you can see a protester actually wearing a baseej helmet as s/he takes a photo of the building in flames. The Newest Deal writes:
As numerous videos have now shown, protesters been have directly confronting security forces in the streets of Tehran today. In many cases, cornered Revolutionary Guard or Basij are disarmed and stripped before they are released. As this uprising grows more radical, one has to wonder the fate of those arms. As those who were alive for or have studied the events of 1979 know, the moment when mobs began raiding military garrisons was a turning point in the revolution. It was not long after that the army stood down and the revolution became a reality.