Suspected terrorists and criminals have infiltrated the immigrant “caravans” traveling to the U.S. border from Mexico, raising new concerns that the crisis has national security dangers, according to a new House report.

The investigative report from the House Homeland Security Committee cited Mexico’s findings with the caravans. “Recently, Mexico has stepped up its efforts to combat the migrant caravans coming in from Honduras, which has included several SIAs, and potentially KSTs travelling towards the U.S. border,” said the report in a reference to “special interest aliens” and “known or suspected terrorists.”

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