koichi nagaoke, his wife, and their 17-year-old daughter died at the scene. strong impact threw their 16-year-old son, shota, out of the van. police found his body 1.5 kilometers away from the accident site. they suspect he was dragged that distance by another car which was allegedly traveling with the car that collided into the van. they say autopsy results show shota suffocated to death. this means he was still alive immediately after the crash and was killed by being dragged and smothered. the news has made headlines across japan, and many people have come to the accident site to offer their condolences. >> translator: i'm not from here, but i couldn't sit still. i just had to come. i wanted to offer my prayers. >> translator: i feel sorry for the victims. >> reporter: police arrested ryuichi komi on suspicion of dragging shota and fleeing the scene. he is said to be a longtime friend of the driver of the car that caused the collision. prior to the accident, the two are believed to have visited pubs and restaurants and were heading to another one. an acqua