From A Vantage point on a scrubby hillside south of San Diego, Mike Jimenez, an agent with the United States Border Patrol, gazes across the Mexican frontier into Tijuana. For decades the poor neighbourhood of Colonia Libertad, rammed up against the border fence, has served as a base for illicit crossings. From its tin rooftops scouts peer over to the United States, monitoring the movements of Mr Jimenez and his colleagues and relaying their positions by mobile phone to migrants as they creep across the border.
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