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Photo by: Arnulfo Franco

IPanama border police patrol by boat in the Darien province on the border with Colombia, near Yaviza, Panama. Panamanian authorities began noticing five years ago that the Darien Gap, the only interruption in the hemisphere-spanning Pan-American Highway, was being used by migrant smugglers, usually to move people from Asia and Africa. (AP Photo/Arnulfo Franco)

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