. >> iranian president mahmoud ahmadinejad hosted a conference questioning the deliberate killing of european jews during world war ii. he was denounced for denying the truth of the holocaust. in line with the government policy he denounced israel, billing itself as the jewish state for the treatment of palestinians. >> being the victim of genocide does not lead you to kill innocent people. you cannot punish the arab people because you are the victim of genocide in europe. >> the sign says palestine square. there are between 15 and 30,000 jews in iran. most of them here in tehran. down behind me is a synagogue, and three schools, there's an excellent restaurant. >> this is a jewish name. >> yes. >> schumer is jewish. >> i have not met a lot of iranians called david schumer. do they know when you say your time. -- name. i'm i say i'm jewish. >> why did so many leave. many of them - i think it is. >> you do. you leave the tehran and iran. it's something else. many come to iran for a visit. >> iran's jews have roots going back 3,000 years. the question everyone is asking, how much surve