Flowers, candles and handwritten messages remembering the 43 missing students line the fence at the National Palace in Zocalo, Mexico City. Geovien So/Barcroft Media/Landov hide caption

itoggle caption Geovien So/Barcroft Media/Landov

Mexico's Attorney General Jesus Murillo Karam addresses a news conference in Mexico City on Friday. He announced the arrest of three suspects in the brutal slaying of 43 students in the country's south. Mario Guzman/EPA/Landov hide caption

itoggle caption Mario Guzman/EPA/Landov

Images from posters made by relatives show 10 of the 12 young people kidnapped in broad daylight from a bar in Mexico City on May 26. No one has claimed responsibility for the brazen abduction. Marco Ugarte/AP hide caption

itoggle caption Marco Ugarte/AP

Children portray drug lords, corrupt police officers and human traffickers in "Niños Incómodos," which was viewed more than 1.8 million times in one week on YouTube. YouTube hide caption

itoggle caption YouTube