Two of the five suspects had been known to the Youth Welfare Office (Jugendamt), which had been active in their families.
The Youth Welfare Office was asked to contact the families along with local social services in order to offer help and support, a local spokeswoman said on Monday.
“It is possible that the children will be taken into care,’’
Police confirmed that the victim left the hospital on Saturday, after being treated.
Investigators declined to give out information about the young woman, citing victim protection concerns.