article_snippet: The alleged attacker, known as an anti-U.S. activist who was previously convicted of hurling a piece of concrete at the Japanese ambassador in Seoul in 2010, was arrested at the scene.
article_snippet: The alleged attacker, who was arrested on Friday last week, and is said to be known as an anti-US activist .
highlights_snippet: Slashed across the face and wrist by knife-wielding activist during forum .
  