Mexican authorities have begun constructing giant tent shelters in the city of Ciudad Juarez to prepare for a possible influx of Mexicans deported under U.S. President Donald Trump's promised mass deportations.

"It's unprecedented," said Ciudad Juarez municipal official Enrique Licon as workers unloaded long metal bracings from tractor trailers parked in the large empty lot yards from the Rio Grande in order to build a tent city for deportees from the United States.

Mexico was raising sprawling tents on the U.S. border Wednesday as it braced for President Donald Trump to fulfill his pledge to reverse mass migration