TOKYO — More than 30 students in a school in Tokyo were taken to hospitals Tuesday after being accidentally exposed to pepper spray inside a classroom, local media reported.

More than a dozen ambulances and police cars were sent to the Tokyo Korean School after students complained of eye pain following the incident reported at around 9:55 am local time, Kyodo News reported, citing the rescue workers.

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Their symptoms are minor, it added.

According to police, a middle school student accidentally used the pepper spray owned by a friend during a recess period at the school in Shinjuku Ward.