The incident was reported to the police by a man who arrived in the mosque for prayers this morning.
Photographs from the place of incident have appeared on the Internet site of the ultra-right National Party.
The National Party's website indicates that the party resents Islam and Muslims.
"Pull mosques down, ban Islam and imprison Islamists for life over their being Islamists," such sentence that appeared on the party's website some time ago.
The National Party also announced on its website that it would screen the controversial film Fitna on Prague's open spaces by which it wants to express its disagreement with the prosecution of the film's author, Dutch parliamentarian Geert Wilders.
The 2008 short film Fitna shows selected excerpts from Suras of the Quran, interspersed with media clips and newspaper clippings showing or describing acts of violence and/or hatred by Muslims.
The film wishes to demonstrate that the Quran, and Islamic culture in general, motivates its followers to hate all who violate the Islamic teachings.
Representatives of the Libertas Independent Agency association that groups Muslims and non-Muslims have already condemned the intention to present the film.
"According to our studies, the National Party does not represent any important part of Czech society and its desperate efforts to make itself visible through the spread of anti-Semitism and xenophobia prove this," association spokesman Lukas Lhotan writes in a statement that CTK has obtained.
The statement says that the association was monitoring the party's steps and if Fitna were shown it was prepared to stage protests.
The Czech Security and Information Service (BIS) is also following the National Party's activities. According to the BIS annual report for 2007, the party participated in many controversial actions the goal of which was to provoke the media interest and enter the conscience of wide public.
The party also operates controversial Internet pages
www.chceteje.cz aimed against immigrants.
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