I want to know the answer to the following question:
What place had police experience violent problems with protesters?
All the background I'm provided with is that "On March 30, 2008 in Athens, during ceremonies marking the handing over of the torch from Greek officials to organizers of the Beijing games, demonstrators shouted 'Free Tibet' and unfurled banners; some 10 of the 15 protesters were taken into police detention.". Is that enough to answer the question?
Answer: no