Police on Monday formally ended their investigation of a man who went on a fatal stabbing rampage in Kawasaki earlier this year targeting schoolchildren before killing himself.

Ryuichi Iwasaki, 51, carried out the knife attack on the morning of May 28 at a spot where students of Caritas Elementary School were waiting for the school bus.

One of the pupils, 11-year-old Hanako Kuribayashi, was killed, while 17 other pupils aged 6 to 12 and a woman were injured. Foreign Ministry official Satoshi Oyama, 39, who was a parent of another student, was also killed in the attack.