US Ambassador to South Korea Mark Lippert leaves after he was slashed in the face by Kim Ki-jong, a member of a pro-Korean unification group, at a public forum in central Seoul in this handout picture provided by Munhwa Ilbo on March 5, 2015. South Korean President Park Geun-hye said on Thursday a knife attack on the US ambassador to Seoul was an "attack on the South Korea-US alliance", Park's office quoted her as saying from the United Arab Emirates. [Photo/Agencies]