The building was being used by a rival political party, she believes. A few miles east along the border, CNN met several more Mexican families who had been sheltering for days in a tent erected by a local humanitarian group. Intimidation was particularly pervasive in local-level elections, experts told CNN, where races could hand the winners broad control over small communities’ police and fiscal resources. Immigrant rights advocates warn closing the border to asylum seekers endangers vulnerable people and ultimately makes the border less safe. They were treated with respect by the US agents, she told CNN, who swabbed them for DNA – likely to ensure that the children were really hers.

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