The U.N. General Assembly adopted a U.S.-drafted resolution on Friday condemning denials of the Holocaust, weeks after Iran sponsored a meeting dominated by speakers questioning the Nazis’ extermination of 6 million Jews in World War Two.

The resolution, co-sponsored by more than 100 countries, including all Western nations, was approved by consensus, without a vote. Iran disassociated itself from the action, calling the resolution a political exercise that Israel would exploit against Palestinians.

The resolution “condemns without any reservation any denial of the Holocaust” and “urges all member states unreservedly to reject any denial of the Holocaust as a historical event, either in full or in part, or any activities to this end.”

But at least 22 nations left their seats empty in the assembly hall, including Bolivia, Chile and Columbia, who had co-sponsored the resolution. Others not attending included Cambodia, Saudi Arabia, South Africa, Sudan, Syria, Tajikistan and Zimbabwe, according to U.S. officials.

Iran is not mentioned by name although the resolution is clearly aimed at a Tehran conference convened in December by President Mahmoud Ahmadinejad. Most speakers expressed doubt about the Nazis’ mass extermination of Jews.

UN