The United States, Germany and Britain have condemned the latest speech by President Mahmoud Ahmedinejad of Iran who says the Nazi Holocaust was a lie and a myth.
At a rally in Teheran, Mr Ahmadinejad said the Holocaust was a "a lie based on an unprovable and mythical claim".
The BBC reports the speech was a repeat of previous assertions.
Germany said the president's comments were a "disgrace to his country."
White House Press Secretary Robert Gibbs cited an assertion by President Barack Obama in a speech to the Muslim world that "denying the Holocaust is baseless, ignorant and hateful".
He said the remarks would "isolate Iran further".
A foreign ministry spokesman in France called the remarks "unacceptable and shocking."
British Foreign Secretary David Miliband said the denial was "abhorrent as well as ignorant".