In the middle of last month, two suspects in their 20s, who were arrested for breaking into a residence in Koganei City, Tokyo, for the purpose of stealing money and other items, are suspected of visiting a store and residence in Mitaka City, Tokyo, on the day of the incident, posing as plumbers, according to interviews with investigators. The Metropolitan Police Department is investigating the suspicion that an anonymous and mobile criminal group targeted multiple crime scenes for robberies and other crimes, and had the perpetrators inspect them.