The United States government believes a type of spying device that can track mobile phones and intercept calls and messages are being used unlawfully in Washington D.C., according to the Associated Press news agency.
But it does not know who's operating these devices, commonly known as Stingrays.
Here's US correspondent Liling Tan with the details.
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ALL: http://www.fsnradionews.com/feeds/0404stringrays-lt-all.mp3