I cannot confirm its accuracy but here is a weblog allegedly describing the treatment of captured students by the Basij in the Ministry of Interior. Money quote:

The floor was covered with black ash and steam was coming out of it. Students were forced to lie on the ground and roll across it. If they hit someone elses feet, they'd get hit with baton.
The guards kept asking, "are you going to make revolution?" and issued family insults.

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