Photo/IllutrationPrince Hisahito with his parents, Prince Fumihito and Princess Kiko, prior to the entrance ceremony at Ochanomizu University Junior High School on April 8 (Pool)

Prince Hisahito expressed astonishment when he learned about an intruder who left two fruit knives on his desk at his school in Tokyo.

The 12-year-old prince, second in line to the Chrysanthemum Throne, was apparently never in any danger as he was in the school gym at the time.

Kaoru Hasegawa, 56, was arrested April 29 on suspicion of trespassing onto the school grounds. He reportedly told police that he opposes the imperial system and had intended to stab Hisahito.

Imperial Household Agency officials on May 10 described Hisahito's response to the April 26 security scare.

On the day of the incident, Hisahito left on a private trip with his family.

He returned to Tokyo the following day after receiving a report about what had happened.

Ochanomizu University Junior High School canceled classes after the 10-day Golden Week holidays. It said classes will resume May 13.

Agency officials said Hisahito did not appear to be rattled about returning to school and has been kicking back at the Tokyo residence of his parents, Prince Fumihito and Prince Kiko.

Agency officials said the imperial couple had expressed concern about the impact the incident would have on other students at the junior high school as well as their parents.

Agency officials are discussing with school authorities and the police what new security measures should be implemented.