The Frankfurt police have arrested suspected fraudsters several times in the past few weeks.
They are said to have cheated on their victims, among other things, with the so-called grandchildren's trick or as false police officers.
The total of seven women and men between the ages of 15 and 25 are possible perpetrators for numerous crimes, the police reported on Thursday.
Frankfurt am Main - Five of the suspects are now in custody.
According to their own statements, the investigators, together with other police stations from the federal territory, clarified acts with a damage amount of several hundred thousand euros.
The investigations into the respective cases are ongoing.