It's been nearly two years since a group of 43 young men went missing in Iguala, Mexico. Details about their fate and the events leading up to the tragic night have been sketchy.
Now, a report from an international panel of investigators introduces some new theories about the events leading up to the disappearance.
Katy Watson is the BBC Correspondent in Mexico City. When Take Two reached her earlier by Skype, she said the report raises a lot of questions about the role of Mexican authorities, who seemed to stand in the way of investigators.