The line from the story that got me:
Police cars were pelted with glass bottles and nearby houses and gardens were vandalized before at least 30 officers, a helicopter and the dog squad were able to end the melee at the suburban home. No one was arrested.
Huh?!? There has to be more to this story - it reminds me of a story that got squashed a couple of years ago about Harvard students pelting campus police with champagne bottles and lobster shells.