Iran has protested against the already controversial logo of the 2012 Olympic Games, saying the emblem is racist and spells the word "Zion", the ILNA news agency said on Monday.

The jagged, multi-colored emblem, which reportedly cost 400,000 pounds ($650,000) features four bold numerals representing 2012, with the signature Olympic Rings emblazoned within the digit zero.

But Mohammad Aliabadi, head of the National Olympic Committee in the Islamic republic, said the logo was undermining the event and accused the British organizers of indulging in "racism", ILNA said.

"Unfortunately, we all are witnessing that the upcoming Olympics ... faces a serious challenge, definitely spawned out of some people's racist spirit," Aliabadi said in a letter to International Olympic Committee President Jacques Rogge.

"The use of the word Zion by the designer of Olympics logo ... in the emblem of the Olympics Games 2012 is a very revolting act," he said, warning if Rogge did not act the logo would "affect the participation of several countries".