On April 14, 2004, police thwarted an attempted bombing of the Holocaust Museum in Budapest:

Budapest's Jewish Museum Bombing Thwarted
Police arrested the spiritual leader of a small Islamic community in Budapest Tuesday on suspicion that he was trying to bomb the city's Jewish museum, THE JERUSALEM POST reported. President Moshe Katsav is currently on an official visit to Hungary but senior law enforcement officials in the country denied that he was the target of the planned attack. "There is no connection whatsoever between today's official visit by the Israeli president and the police action taken this morning," National Police Commissioner Laszlo Salgo said. Tibor Pal, a senior Interior Ministry official, also said that Katsav's presence in the Hungarian capital "has nothing to do with the police action taken today."
Police identified the suspect as a 42-year-old dentist of "Palestine origin" and said he was the spiritual leader of a small Islamic community in Budapest. He is a naturalized Hungarian citizen.
The suspect, whose name was not released, was charged with being involved in "preparation for a terrorist attack." In connection to the case, two Syrians were charged "with preparations for a crime against property."
The only permanent Jewish museum in the capital is the Holocaust Memorial Center to be inaugurated Thursday by Katsav. The timing of the police sweep thus appeared linked to Katsav's planned visit to the museum.