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U.S. Ambassador to South Korea Mark Lippert, center, gets into a car to leave for a hospital in Seoul, South Korea, Thursday, March 5, 2015 after being attacked by a man. Lippert was slashed on the face and wrist by a man wielding a blade and screaming that the rival Koreas should be unified, South Korean police said Thursday. (AP Photo/Yonhap, Kim Ju-Sung) KOREA OUT
U.S. Ambassador to South Korea Mark Lippert, center, gets into a car to leave for a hospital in Seoul, South Korea, Thursday, March 5, 2015 after being attacked by a man. Lippert was slashed on the face and wrist by a man wielding a blade and screaming that the rival Koreas should be unified, South Korean police said Thursday. (AP Photo/Yonhap, Kim Ju-Sung) KOREA OUT

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    U.S. diplomat's attacker behind bars

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U.S. diplomat's attacker behind bars

Police probe U.S. ambassador attacker's trips to N. Korea. CNN's Ivan Watson reports.

U.S. diplomat's attacker behind bars

Police probe U.S. ambassador attacker's trips to N. Korea. CNN's Ivan Watson reports.