A group of four senators is asking the Department of Homeland Security to turn over more information about the possible use of devices that allow for surveillance of cellphone activity around Washington, D.C., according to a report.

Sens. Ron Wyden, D-Ore., Ed Markey, D-Mass., Rand Paul, R-Ky., and Cory Gardner, R-Colo., said the administration should publicly disclose the details of whether cell-site simulators, known as a Stingray, were used to conduct surveillance in the D.C. metro area last year.

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