Charles U. Farley"Using phone tower data, police were able to roughly triangulate who had been near the Liangma River the night of Nov. 27. They called in vigil attendees or visited their homes at night. Most participants were let go after a few hours of questioning, but the editor watched with a growing sense of dread as her friends were detained one by one."
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https://www.npr.org/2023/01/11/1148251868/china-covid-lockdown-protests-arrests
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