The head of Turkey’s medical association has been detained for calling for an investigation into claims that the army used chemical weapons against Kurdish militants.
Sebnem Korur Fincanci is suspected of spreading terrorist propaganda and insulting Turkey, prosecutors say.
A leading human rights activist, she made the comments on pro-Kurdish media.
Turkey denies using chemical weapons against the PKK, which the EU and the US regard as a terrorist organisation.
Last week the militant group released video that it said showed Turkish troops releasing a substance into a cave as well as its effects on a male and female fighter. The PKK identified 17 of its members who it said had been killed recently by such weapons in northern Iraq.