You will be given a definition of a task first, then some input of the task.
In this task, you will be presented with a question in Dutch language, and you have to write the person names from the question if present. B denotes the first item of a phrase and an I any non-initial word. Phrase used for the person name - PER. There can be instances with no person name entity, then return 'None'.

De acties van de politie werden aanvankelijk gedwarsboomd omdat de gijzelaar de berichtgeving nauwgezet volgde op televisie en radio .
Output:
None