Howard Cheng"A month after his return to #HongKong in 2022, police called him to Mong Kok police station. They then identified themselves as being from the #NationalSecurity office and presented him with photos of his face in protests that had not appeared online. He suspected they were taken by someone in the UK working with the #HongKongPolice."
https://www.ft.com/content/793a32bf-2184-4f0f-8690-51ca6632b6b6