article_snippet: The motive for Kim Thursday?
article_snippet: Was the attack part of a larger plot?
article_snippet: Did Kim have any help, implicit or explicit?
article_snippet: Kim insists that this was done by Kim," Yoon said.
article_snippet: But police are still investigating if Yoon acted alone and what Yoon motive was.
article_snippet: The South Korean leader vowed that authorities will "take necessary measures ... with utmost seriousness and urgency" to get to the bottom of the latest attack.