A woman leading protests over the abduction of more than 200 girls in Nigeria has been detained on the orders of the president’s wife.
Naomi Mutah took part in a meeting called by First Lady Patience Jonathan and was then taken to a police station, they say.
Mrs Jonathan reportedly felt slighted that the mothers of the abducted girls had sent Ms Mutah to the meeting.
Analysts say Mrs Jonathan is a politically powerful figure.
Ms Mutah, a representative of the Chibok community where the girls were seized from their school more than two weeks ago, last week organised a protest outside parliament in the capital, Abuja.
The protesters, and many Nigerians, feel the government has not done enough to find the missing girls, who are thought to have been kidnapped by militant Islamist group Boko Haram.