Jewish community representatives on Tuesday voiced alarm after Hungarian leader Viktor Orban spoke out against creating "peoples of mixed-race".

In a speech in Romania's Transylvania region, which has a large Hungarian community, the 59-year-old ultra-conservative prime minister criticised mixing with "non-Europeans".

Terming Orban's speech "stupid and dangerous", the International Auschwitz Committee called on the EU to continue to distance itself from "Orban's racist undertones and to make it clear to the world that a Mr. Orban has no future in Europe."

The speech reminds Holocaust survivors "of the dark times of their own exclusion and persecution," the organisation's vice-president Christoph Heubner said in a statement sent to AFP.

Heubner called specifically on Austrian Chancellor Karl Nehammer to make a stand when he hosts Orban on an official visit to Vienna on Thursday.

"We do not want to become peoples of mixed-race," Orban said on Saturday.

Orban, known for his anti-migrant policy, has made similar remarks in the past but without using the Hungarian term for "race," according to experts.

Government spokesman Zoltan Kovacs said Orban's speech had been "misinterpreted" by those who "clearly don't understand the difference between the mixing of different ethnic groups that all originate in the Judeo-Christian cultural sphere, and the mixing of peoples from different civilisations".

In his speech, Orban also seemed to allude to the gas chambers of the German Nazi regime when criticising Brussels' plan to reduce European gas demand by 15 percent.

"I do not see how it will be enforced -- although, as I understand it, the past shows us German know-how on that," he said.

Hungary's Jewish community has also slammed the speech.

"There is only one race on this Planet: the Homo Sapiens Sapiens," chief rabbi Robert Frolich wrote on Facebook.

And Orban advisor Zsuzsa Hegedus handed in her resignation over the "shameful position", calling the speech "a pure Nazi text," according to news outlet HVG.

Bogdan Aurescu, foreign minister of fellow EU member Romania, said Orban's "ideas" were "unacceptable".

mg-pmu-anb/jza/pvh