According to the broadcaster ARD, the searches took place on the morning of January 6th. The police reportedly seized some technical devices during the searches.
A 19-year-old man, whose flat was searched, is reportedly being treated as a witness in the case and has been questioned by the police.
The man earlier said on Twitter that he had long been acquainted with a hacker operating under the alias "0rbit," who is suspected of having been behind the data breach, the broadcaster said. The young man reportedly works in IT.
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German media reported on 4 January that hackers had published the addresses, phone numbers, some work and personal correspondence of hundreds of German politicians, as well as some internal party documents.