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Police operation (symbol image)
Photo: John McDoughall / AFP
In the Wuppertal House of Integration, an employee of the authority was probably seriously injured with a knife.
A police spokesman said the operation was initially assumed to be a threatening situation.
The injured person was then found on site.
The situation is under control.
The officers arrested a suspect.
The city said the woman's colleagues "locked the perpetrator" until the police arrived.
According to the city, the House of Integration connects institutions that look after immigrants and refugees in Wuppertal.
official in the hospital
According to information from the police, the woman is seriously injured and her life is not in danger.
Paramedics took her to the hospital.
In fact, according to initial findings, a knife is said to have been used.
"I am very affected by this terrible attack," said Wuppertal's Mayor Uwe Schneidewind.
He wished the "colleague all the best for her recovery process" and thanked the employees who "overwhelmed the perpetrator".
bbr/dpa