Police on Tuesday searched the offices of the operator of Tokyo's Roppongi Hills commercial complex, where a 6-year-old boy died last week after his head was crushed by an automatic revolving door, as well as the distributor of the door system.
Investigators searched seven locations, including the headquarters of Mori Building Co., Sanwa Tajima Corp. and its parent company, Sanwa Shutter Corp., for evidence of professional negligence resulting in death. The manufacturer of the door is part of the Sanwa Shutter group.
The unusually prompt police action follows growing public concerns about the widely used automatic doors.