Russian opposition leader Aleksei Navalny says listening devices and even a video camera were found in his office in Moscow.
The opposition blogger said after finding the "bug" in his office he telephoned police who found two microphones, a radio transmitter, a camera, and a battery to run the equipment.
Navalny posted a video of what he claimed were some of the devices found in his office.
Navalny is currently under investigation after allegations surfaced that he committed crimes while serving as an adviser to the Kirov region's governor in 2009.
His supporters say the charges are politically motivated and designed to pressure Navalny into stopping his political activities.
Based on reporting by ITAR-TASS and Interfax