Cheongju, April 28 -- A special-ed student attacked people with a weapon at a high school in Cheongju on Monday, injuring seven people, including the principal and himself, an official told Yonhap News Agency.

The attack happened around 8:40 am (local time) in the city, some 110 kilometres south of Seoul, when the second-grade high school student, 18, walked out of a classroom during a meeting with his counsellor and began stabbing people in the corridor.

He then walked out of the school and injured two passersby before jumping into a nearby reservoir.

"I was taking my children to kindergarten and driving slowly near the school because of traffic when the student came up and knocked on the door," one of the victims, a 43-year-old surna...