Just have a look at the images on this link: http://www.isna.ir/ISNA/NewsView.aspx?ID=News-1472562&Lang=P The polce is standing bye while some people washing away the evidence! This "job" was planed and executed by locals. They killed another university professor that was against the regime.
US rally shows support for ex-Marine held by Iran on spying charges (AP)
from the article: Iran: Israel, U.S. killed pro-Mousavi nuclear scientist