Cast of "The Expendables 3", holding up banners reading "Bring back our girls", part of a campaign calling for the release of the abducted Nigerian schoolgirls being held by Nigerian Islamic extremist group Boko Haram, as they arrive at the red carpet for the screening of "The Homesman" at the 67th Cannes Film Festival in Cannes, southern France, May 18, 2014. (Xinhua/Chen Xiaowei)