KYOTO--While panic spread on a Shinkansen bullet train, a knife-wielding assailant remained silent and expressionless while he methodically hacked the body of an unconscious passenger, according to a witness.

“The suspect repeatedly hit the male victim with a knife without changing his facial expression or saying anything,” Yoshihiko Inamoto, 55, a free-lance editor, said about the June 9 attack that killed one man and injured two women.

He described the scene in an interview early on June 10 at Kyoto Station. He had taken a Shinkansen that replaced the Nozomi No. 265, where the fatal rampage occurred.

Inamoto said he heard a woman scream around 9:50 p.m., when the bullet train was running between Shin-Yokohama and Odawara in Kanagawa Prefecture on the Tokaido Shinkansen Line bound for Shin-Osaka.

He looked behind in Car No. 12 of the train and saw the suspect in a skirmish with the male passenger in the aisle near the door. The suspect did not say anything and had a blank look on his face, Inamoto said.

The assailant, wearing a black T-shirt, repeatedly hacked the victim’s upper body with a weapon that looked like a “nakiri-bocho” (rectangle-shaped knife), Inamoto said.

Passengers in the 12th car fled to the 11th car. Inamoto said he escaped to the deck between the two cars and called the police.

Passengers in the 11th car also fled, and the carriage soon became empty.

Many passengers followed a conductor’s instructions to remove the seats from the chairs and use them as shields.

Inamoto said he returned to the deck and peered inside the 12th car.

He said the victim was motionless on his back. The suspect was on top of the victim and repeatedly hacked his body.

A conductor, using a trunk as a shield, approached the suspect and persuaded him to surrender.

“Everyone was panicking,” Inamoto said. “I had never thought that I would experience something like this. It was terrible.”