People take part during a march in the context of the 4th anniversary of the disappearance of the 43 students of a teachers' college in Ayotzinapa, in Mexico City, capital of Mexico, on Sept. 26, 2018. According to local press, people took part in a march to commemorate the 4 years since the disappearance of the 43 students of the "Raul Isidro Burgos" teachers' college of Ayotzinapa. (Xinhua/Francisco Canedo)