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Almost two million undocumented immigrants have been deported from the US since Barack Obama entered the White House, more than under any previous president.
Many of those sent back to Mexico have to walk through a door in the fence separating California and the Mexican town of Tijuana. Some were caught trying to enter the US illegally, others had lived in the US - without papers - for years.
The BBC's Valeria Perasso reports from both sides of the border on what happens to deportees once they pass through this door.