The Iranian president's latest denial of the Nazi Holocaust has drawn strong condemnation from Western powers.

Speaking in the capital, Tehran, President Mahmoud Ahmadinejad said the Holocaust was "a lie based on an unprovable and mythical claim".

Germany said the comments were a "disgrace to his country" while the US said they would "isolate Iran further".

In reaction, White House Press Secretary Robert Gibbs cited President Barack Obama's assertion in a speech to the Muslim world that "denying the Holocaust is baseless, ignorant and hateful".