Federal immigration agents flooding U.S. streets are using a new surveillance tool kit whose increasing use on observers and bystanders is alarming civil liberties advocates, lawmakers and activists.

The force said the trial will test how the technology operates in a “railway setting” and follows months of planning and research aimed at improving public safety. The operation began at London Bridge ...

On Wednesday, DHS disclosed online that it has been using a facial recognition app Mobile Fortify that uses "trusted source photos" to compare scans of people's faces that agents take to verify their ...