McALLEN (CBSNEWS.COM) – At the heart of the immigration crisis are images of children and families held in detention centers. CBS News cameras were allowed exclusively inside the largest migrant processing facility in the country.

Norah O’Donnell speaks with a mother who came to the U.S. from Venezuela with her young son. (credit: CBS News)

One woman at the Ursula processing facility, who is there with her young son, explained how she crossed into the U.S. illegally in search of a safer and better life.

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