Two high school students and a man were wounded in a knife attack on Saturday just outside the University of Tokyo ahead of nationwide entrance exams. A teenager who was apparently frustrated with his academic performance has been arrested on suspicion of attempted murder, police said.

A 72-year-old man from Tokyo was seriously injured after he and the two other victims — a male and a female student, ages 17 and 18 respectively — were slashed in the back around 8:30 a.m. outside one of the gates to the university's main campus in the capital's Bunkyo Ward.

The two high school students, both from Chiba Prefecture, did not sustain life-threatening injuries, the police said, with authorities quoting the 17-year-old suspect as saying he was not acquainted with the three.