 Now their whereabouts are unknown as immigration agents look to arrest them. U.S. officials tell us, saying they're among a group of over 400 migrants DHS identified in the U.S. from Tajikistan, Uzbekistan, Moldova, Kyrgyzstan, Georgia, and Russia as subjects of concern because they were brought to the U.S. by an ISIS-affiliated smuggling network, something the FBI director warned about earlier this year.