The 59-year-old politician was transported to a hospital, and the male assailant was arrested at the scene.

SEOUL—The head of South Korea’s opposition party was stabbed in the neck during a Tuesday visit to the port city of Busan.

Lee Jae-myung, the 59-year-old leader of South Korea’s Democratic Party, remained conscious after being attacked by a male assailant, who was arrested at the scene, according to South Korea’s semiofficial Yonhap News Agency. Blood could be seen on his shirt collar. Lee was transported to a hospital in Busan within 20 minutes of getting attacked, Yonhap reported.