A migrant family runs from tear gas released by US border patrol agents near the fence between Tijuana, Mexico, and San Diego.

A migrant family runs from tear gas released by US border patrol agents near the fence between Tijuana, Mexico, and San Diego.

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Dozens of migrants get arrested on both sides of the US-Mexico border

They've spent weeks trekking across Mexico, trying to reach the United States. But dozens of migrants will be deported and will never touch US soil, Mexican authorities said.