(19.5.2017) The source told The Telegraph: „If there was a file on someone, it meant they had come to notice. We opened a temporary file and did a preliminary investigation. It was then decided whether we should open a permanent file on them“.

A file would be opened on „someone who sympathises with a certain group, or is friends with a specific person“ and the purpose was to “assess whether the person was a threat“, the source added.