Six Somali pirates were captured by sailors of the frigate Karlsruhe in the Gulf of Aden.
However, the pirates were immediately released on the orders of the German government, officials told the BBC.
"We had forces on board the frigate, and they used fast small boats, and together with the helicopter we were able to surround the pirates and disarm them," he said.
He said the decision not to detain or arrest them was taken by the German government in Berlin.
A spokesman for the EU's mission off Somalia, Cdr Achim Winkler, told the BBC's Europe Today programme that
Germany would only bring pirates to justice where German interests were hurt.
This would be the case if a German ship was attacked or German citizens were killed or injured, he said.
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