TOPSHOT - Forensic personnel of the Mexican Attorney General work in the exhumation of human remains found during the activities of the fourth National Search Brigade, in Huitzuco de los Figueroa, Guerrero state, Mexico, on January 21, 2019. - More than 40,000 people are missing in Mexico, which has been swept by a wave of violence since declaring war on its powerful drug cartels in 2006. But there is even a more tragic group: some 20 families who have lost children not once but twice, when the ones who remained went looking for their missing siblings and ended up disappearing too. (Photo by Pedro PARDO / AFP)