Budapest -- Hungary's prime minister called on police Monday to block a march reportedly planned by neo-Nazi groups this weekend in Budapest to commemorate the death of Adolf Hitler's deputy Rudolf Hess.

"Budapest and Hungary cannot be the paradise of neo-Nazis and their demonstration has to be prohibited," Prime Minister Gordon Bajnai told the Hungarian news agency MTI.

He urged police "to use all legal means possible to prohibit" the event.

The Nepszabadsag newspaper on Monday reported that a local neo-Nazi group, the Hungarian National Socialist Front, was organising a march and several concerts on Saturday to commemorate Hess's death.

Advertisements about the event have appeared on the Internet in English and German to attract fascist groups from abroad, it said.

One notice found online said the march would take place Saturday, but added that the location would only be made public on Thursday.

Hungarian police have declined to comment, but it has promised to release information on Wednesday, when the deadline to announce a demonstration for Saturday expires.

Meanwhile, some 50 civic organisations have announced a counter-demonstration on Saturday in downtown Budapest.

Hess was Hitler's deputy in the German Nazi Party from the mid-1930s. He was sentenced at the Nuremberg war crimes trials in 1946 to life imprisonment at Spandau prison in Berlin where he died in 1987, its lone inmate.

AFP/Expatica