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Emergency personnel are seen at the scene of a stabbing incident at Tokyo University on Jan. 15. Several high school students sitting for their university entrance exam were injured.ISSEI KATO/Reuters

Several high school students sitting for their university entrance exam in Tokyo were wounded on Saturday in an apparent knife attack, Japanese media said.

Public broadcaster NHK said three people were conscious after being injured in the morning when another student attacked them with a bladed object as they gathered to take their entrance exam.

The alleged assailant, a 17-year old high school student, was arrested, the Asahi newspaper said.

Half a million high school students across Japan are taking their annual university entrance exams this weekend in hundreds of venues across the country.

Tokyo’s Metropolitan Police Department said it could not comment on the details of the attack nor confirm any arrests.

Violent crimes are exceedingly rare in Japan, but there have been a spate of knife attacks by assailants unknown to the victims.

In October, a man dressed in a Joker costume stabbed more than a dozen people on a train carriage in Tokyo, sending passengers screaming down the aisles and scrambling out of windows to escape. A few months earlier, a man wounded several people in a knife attack on a Tokyo commuter train.

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