The German Federal Prosecutor's office on Monday said three German nationals were arrested under the strong suspicion of having worked for the Chinese secret service.
Prosecutors believe the three may have been involved in research projects that could be useful for China to expand its maritime power.
The three suspects, Herwig F, Ina F. and Thomas R, were arrested by officers of the Federal Criminal Police Office (BKA) in the western German cities of Düsseldorf and Bad Homburg.
The defendants' homes and workplaces were also searched.
The charges relate to espionage "at a point in time that cannot be precisely determined before June 2022."

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