Demonstrators carrying posters of the missing students march in protest against the disappearance of 43 students in the state of Guerrero, in Mexico City, Wednesday. Federal police detained Iguala Mayor Jose Luis Abarca and his wife, Maria de los Angeles Pineda, who are accused of ordering the Sept. 26 attacks on teachers and college students that left six dead and 43 still missing. (AP-Yonhap)