Mayor, wife detained in case of Mexico's 43 missing students, believed to have ordered attack

Children place candles next to six mock coffins, representing those who died in a police attack in Guerrero state, placed outside the National Palace by protesters in Mexico City, Saturday, Nov. 1, 2014. Relatives of the missing have grown increasingly frustrated at the pace of the investigation of the Sept. 26 police attack in the city of Iguala, that left six dead and 43 missing students. The missing were apparently handed over to a drug gang by city police. (AP Photo/Marco Ugarte) (The Associated Press)

Protesters stand next to six mock coffins, representing those who died in a police attack in Guerrero state, as they demonstrate outside the National Palace in Mexico City, Saturday, Nov. 1, 2014. Relatives of the missing have grown increasingly frustrated at the pace of the investigation of the Sept. 26 police attack in the city of Iguala, that left six dead and 43 missing students. The missing were apparently handed over to a drug gang by city police. (AP Photo/Marco Ugarte) (The Associated Press)

FILE - In this May 8, 2014 file photo, the mayor of the city of Iguala, Jose Luis Abarca, right, and his wife Maria de los Angeles Pineda Villa meet with state government officials in Chilpancingo, Mexico. Federal police early Tuesday, Nov. 4, 2014 detained the couple, who are accused of ordering the Sept. 26 attacks on teachers' college students that left six dead and 43 still missing. The Iguala police chief is still a fugitive. (AP Photo/Alejandrino Gonzalez, File) (The Associated Press)