Nigeria girls protest leader 'held'

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, activists say.

Naomi Mutah Nyadar 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 Nyadar to represent them.

Analysts say Mrs Jonathan is a politically powerful figure.