The sensor system of the automatic revolving door that crushed a 6-year-old boy to death Friday in Tokyo's Roppongi Hills complex had been adjusted upward to respond only to objects standing 135 cm or higher, police sources said Monday.
It is believed the sensor on the ceiling above the door did not activate to stop the door from revolving because it failed to detect the victim, Ryo Mizokawa, who was 117 cm tall, they said.
The accident occurred at the Mori Tower building in the popular business and entertainment complex.