Video of French hostages held by Nigeria's extremists Boko Haram; father says they're weak

A French hostage has spoken in a video filmed three days ago with his family, weeks after extremists kidnapped them from northern Cameroon.

The video's audio airs a voice that identifies himself as Tanguy Moulin-Fournier. He says the Islamic radical network known as Boko Haram wants all its members freed, especially women and children, from Nigerian and Cameroonian custody.

The man says his family is losing strength every day and they are starting to be sick.

The family was kidnapped on Feb. 19.

The video was not immediately available, but a media source who viewed it says it shows the Moulin-Fournier family, including the four children. The source spoke on condition of anonymity because he was not authorized to speak to press.