The Department of Homeland Security is paying undercover informants inside the migrant caravan headed to the southern border, two DHS officials told NBC News on Tuesday.
There are about 4,000 migrants in the caravan, most of them from Central America, and to communicate, they are using WhatsApp to text. DHS personnel are monitoring those messages, the officials said, as well as working with the Mexican government to keep track of the size of the caravan and any possible security threats.
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