Germany has criticized a letter from Iran's president to Chancellor Angela Merkel, saying it contains what it calls unacceptable statements about Israel and the Holocaust.

German government spokesman Ulrich Wilhelm told reporters Friday, that President Mahmoud Ahmadinejad's letter did not mention Iran's nuclear program.

Wilhelm said the Iranian leader also remained silent about the fighting in Lebanon and Israel. But he said the letter questioned Israel's right to exist and the Holocaust.

Denial of the Holocaust is a crime in Germany.

The spokesman said Berlin will not make public the entire content of the letter. He also said the German government will not engage in correspondence with Mr. Ahmadinejad.