By David Alire GarciaMEXICO CITY (Reuters) - A historic Mexico City church has morphed into the capital's largest migrant shelter, with hundreds of sleeping mats stacked high inside and a growing tent city clustered around it where many await news before resuming their risky trek north. The church is a way station for migrants as most wait for unpredictable appointments with U.S. border agents through a mobile phone app. DHS did not share overall wait times and it is unclear if they have lengthened or shortened since then. Arriving at the church earlier this week, 30-year-old Venezuelan migrant Alejandro Urbina explained near his tent that he logs onto the app every day. Reverend Benito Torres, the church's pastor, explained that the Christian imperative to help the most vulnerable is what motivates him.

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Persons: David Alire Garcia, Eva Alvarez, Dominick, Alejandro Urbina, Trixy, Benito Torres, Dave Graham, Lisa Shumaker Organizations: David Alire Garcia MEXICO CITY, Catholic, U.S . Department of Homeland Security, DHS Locations: Mexico City, America, United States, Honduran, San Pedro Sula, Honduras, U.S, Belgian, Colombia, Panama, New York, Mexican