Four U.S. senators on Wednesday urged the U.S. Homeland Security Department (DHS) to disclose additional information about unusual cellular surveillance activity that has been detected around the nation’s capital.

The senators – Ron Wyden and Ed Markey, both Democrats, and Republicans Rand Paul and Cory Gardner – said the Trump administration should make public additional details about possible surveillance using cellphone-site simulators around Washington.

“The American people have a legitimate interest in understanding the extent to which U.S. telephone networks are vulnerable to surveillance and are being actively exploited by hostile actors,” the four said in a letter reviewed by Reuters.

Homeland Security did not immediately comment, but said in a March 26 letter to Wyden that DHS “has observed anomalous activity in the National Capital Region that appears to be consistent with International Mobile Subscriber Identity (IMSI) catchers. (DHS) has not validated or attributed such activity to specific entities or devices”.

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