The United States has asked Iraq to curb a military campaign against Kurd separatists that has reportedly killed 1,800 and caused 100,000 more to flee the country, State Department officials said Tuesday. The officials said April Glaspie, the new U.S. ambassador to Iraq, had "expressed U.S. humanitarian concern" and "asked for restraint" in a conversation last weekend with a senior Iraqi Foreign Ministry official. "We hoped to make them aware of worldwide concern and what it does to the image of Iraq," said a U.S. official who asked not to be identified. Iraq is engaged in U.N.-sponsored peace talks with Iran aimed at ending their eight-year war.