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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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    Why mass knife attacks are more common in Asia

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Why mass knife attacks are more common in Asia

Mass knife attacks have plagued East Asia's recent history. CNN's Kyung Lah reports.

Why mass knife attacks are more common in Asia

Mass knife attacks have plagued East Asia's recent history. CNN's Kyung Lah reports.