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By James Pearson and Ju-min Park SEOUL (Reuters) - U.S. ambassador to South Korea Mark Lippert was slashed in the face by a Korean nationalist but was not seriously hurt during an attack at a breakfast forum held in the capital on Thursday to discuss Korean reunification, police and witnesses said. In 2010, Kim tried to attack the Japanese ambassador to Seoul by throwing a piece of concrete and was given a suspended jail term, according to police. Witnesses and police said Kim used a small fruit knife in the attack, which took place inside a large government arts center across the street from the heavily guarded U.S. embassy on Seoul's main ceremonial thoroughfare. U.S. President Barack Obama quickly called Lippert to wish him a speedy recovery, a White House official said.