As Japan grapples with a series of robberies occurring in and around Tokyo, attention has turned to lists of personal information that perpetrators use to narrow down their targets.

Since August, at least seven residents have been robbed across Tokyo, Saitama, Chiba and Kanagawa prefectures with a similar modus operandi: recruiting workers through shady job postings on social media and targeting the homes of the elderly.

These incidents have apparent links to dark part-time jobs and new quasi-gangster groups known as tokuryū.