Enlarge / US Capitol Building in Washington, DC. (credit: Getty | Tetra Images | Henryk Sadura)

The federal government has formally acknowledged for the first time that it has located suspected and unauthorized cell-site simulators in various parts of Washington, DC.

The revelation, which was reported for the first time on Tuesday by the Associated Press, was described in a letter recently released from the Department of Homeland Security to the offices of Sen. Ron Wyden (D-Oregon).

“Overall, [DHS’ National Protection and Programs Directorate] believes the malicious use of IMSI catchers is a real and growing risk,” wrote Christopher Krebs, DHS’ acting undersecretary, in a March 26, 2018 letter to Wyden.