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SEOUL, South Korea (AP) -- President Barack Obama says the U.S. and its allies are working on ways to send a "clear message" to Iran on its nuclear program.

Iran's foreign minister said Wednesday that Iran will not ship its low-enriched uranium out of the country for processing, again rejecting a U.N. plan aimed at thwarting any attempt by Iran to make nuclear weapons.

Obama said that over the next several weeks, the U.S. and its allies will work on developing a package of potential sanctions designed to pressure Iran to accept what Obama said is a fair offer.

Obama spoke at a news conference in Seoul, South Korea, with President Lee Myung-bak (lee myuhng bahk).

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