[vestrigi]

So how did the police find out about the identities of the 10 people who have never been arrested? Because they posted to social media about them attending a demonstration? How was it connected to them being demonstrators? Where their identities collected during protests but they weren't arrested? Article leaves that open.

[orangepurple]

Pure speculation: Your national ID is linked to your cell phone via the payments and the banking system. IMEIs are globally unique and its possible to triangulate cell phones by constantly monitoring signal strength to nearby towers. Intelligence agencies know where almost every person is at all times since most people have their cell phone turned on and on their person as they move around. The solution is obtaining SIM cards and cell phones without ID, which is probably why that is outlawed in many places.