TOKYO, June 10 (Xinhuanet) -- Fifty-eight students at a high school in Hikari, south Japan's Yamaguchi Prefecture, were injured Friday after a glass bottle containing gunpowder was thrown into a classroom by one of the students at the school and exploded.

    According to the National Police Agency, one male student was seriously injured but remains conscious. Others were slightly injured, with nausea or pain in their eyes or ears.

    About 35 students were in the classroom, but students in different classes were also taken to hospital for treatment for shock.

    An 18-year-old male student at the prefectural government-run Hikari Senior High School was arrested on suspicion of assault, the police agency said.

    The police said the boy, a third-year student who belongs to a different class from the one where the incident occurred, admitted throwing the bottle.

    The student was quoted as saying that he made the explosive device by himself.

    The student, whose name is being withheld because he is a minor, threw the bottle from the hall on the second floor into the classroom, where a third-year students' class was in session at about 10 a.m. (0100 GMT), the police said.

    The bottle exploded and shattered, injuring many of the students, the police said.

    The student was caught by a teacher after throwing the homemade bomb and was arrested by the police later. Enditem