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 Friday.
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 Friday .
highlights_snippet: The alleged attacker, known as an anti-U.S. activist, was arrested Friday .