WASHINGTON - Six major world powers have agreed to begin putting together proposed new sanctions against Iran over its suspect nuclear program after China dropped its opposition, U.S. officials said Wednesday.

China, long a holdout against fresh international penalties against Iran, signaled its willingness Wednesday to consider a U.N. Security Council sanctions resolution, two U.S. government officials said.

That would appear to improve prospects for passing a resolution aimed at increasing economic and diplomatic pressure on Iran to scale back its nuclear ambitions, which Tehran insists are limited to developing nuclear power for peaceful purposes.

In another sign of movement on the Chinese front, Iran's state media reported Wednesday that the country's top nuclear negotiator will travel to Beijing to discuss possible U.N. sanctions.

Iranian state television said Saeed Jalili will hold talks Thursday with senior Chinese officials "concerning the nuclear program."

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