FILE- In this April 30, 2015, file photo, a Capitol Hill staffer looks down at papers while on a cell phone while walking inside the Russell Senate Office Building on Capitol Hill in Washington. The Department of Homeland Security acknowledges detecting suspected cell tower simulators in Washington, D.C. These devices can track specific cell phones and even intercept or divert calls and text messages. (AP Photo/Jacquelyn Martin, File)

Use Information This content is intended for editorial use only.
For other uses, additional clearances may be required.