Victim sustained head injuries in the assault
TokyoReporter
Incident stemmed from an ongoing dispute between rival groups associated with the suspects and the victim
Upon arrival of police, suspect had fled scene
Suspect said, 'I have nothing to say right now'
One victim said, 'My throat suddenly started feeling scratchy'
Association said, 'We take this situation very seriously'
Toyoji Sudo's family filed a missing person report on Sunday
Investigators have classified Yoichi Hatta as a 'crucial wanted suspect'
Commercial sex business was business was struggling financially at time of murders
Under Japan’s penal code, human trafficking requires a financial transaction to 'buy' or 'sell' a person