Pope Francis waves from the popemobile upon arrival in Ecatepec --a rough, crime-plagued Mexico City suburb-- where he is to celebrate an open-air mass, on February 14, 2016. The pope has chosen to visit some of Mexico's most troubled regions during his five-day trip to the world's second most populous Catholic country. AFP PHOTO/ JULIO CESAR AGUILAR / AFP / Julio Cesar Aguilar Fuentes