Bill Keller reports:
[In] Isfahan the police response seemed far tougher. At one point, a white S.U.V. with a red ambulance-style light raced up behind a knot of protesters and smashed into them, running one over before racing a few blocks to the protection of the riot police. Bands of Basiji, the authorized plainclothes vigilantes riding motorbikes and wielding long truncheons, were let loose by the hundreds to sow fear far afield from the actual unrest. Many wore the green headbands of the opposition possibly to camouflage, or to confuse.
More from the NYT here.