That's the European police state in action: "Police caught the young selfie-taker and forced him to delete his picture."
I'm not sure which place is more paranoid about picture taking, Europe or America.
A few years ago, I was walking along the Ocean Blvd from Sunny Isles to Hallandale and on that walk I was taking pictures of some of the houses beside the road. Mostly details such as gates, windows, balconies, flowers, etc. Suddenly a police car drove by, a big burly cop stepped out, asked me if I speak English and then told me they received a report that I was aiming my camera at a bedroom window and photographed people inside the bedroom. Which would be of course impossible. Fortunately, he didn't ask me to delete the pictures, just advised me to stop shooting. I obliged and headed straight for my hotel.
This past March, I stopped at a public beach in Naples, FL, took a few pictures of the beach, waves and the fishing pier in the distance, and then returned to my car with the intention to continue to the next sightseeing point. Suddenly a young couple ran after me and they demanded to see the pictures I took to make sure I didn't photographed their little daughter. Since I didn't have to worry about doing anything wrong, I showed them the pictures, but it was highly annoying nevertheless.