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Priscila Cartagena (right) holds a photo of her daughter Yesenia Marleni Gaitán Cartagena as she walks with a group of Central Americans during a demonstration in the center of Tapachula, Mexico, on December 16, 2013. The group, mostly mothers looking for their children, spent 17 days touring 14 Mexican states in search of their loved ones, most of whom had disappeared while following the migrant trail north. <br />
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Cartagena, who lives in Tegucigalpa, says her daughter migrated north in 2008, headed to the United States, and last called her from Nuevo Laredo, Mexico. She hasn't heard from her since.