A court in Budapest has ordered the temporary blocking of about 20 websites that carry Holocaust denial material.

The sites sell the Hungarian edition of a book by a Swedish author that denies that the Nazis committed genocide and makes excerpts available to read on-line, Budapest chief prosecutor Tibor Ibolya said Tuesday, Hungary Today reported.

An investigation of the Hungarian publisher was suspended while the head of the company is out of the country, according to Hungary Today.

Public Holocaust denial is a crime under a law passed in Hungary in 2010, and is punishable by up to three years in prison. (JTA)