"She was told she would have to stand trial," WDR said.
Kamer told WDR there was no evidence for the charges.
Crackdown on media, government dissidents
Kamer's family has told German-language newspaper "Die Zeit" that police had accused the 39-year-old of taking photos of a military area. According to "Die Zeit," Kamer and her lawyer suspect her reports for foreign media on "unpleasant issues" in Turkey contributed to her arrest.
The arrests are the latest in Ankara's broad crackdown on the media and government dissidents following a failed coup in July. A state of emergency imposed after the coup has allowed the government to detain dozens of journalists and shut down more than 170 media outlets.