Mr R wrote:
How stupid
http://news.bbc.co.uk/1/hi/england/london/6213559.stm

I'm all for banging up the asbo generation, however
"The attack came after pre-emptive arrests were made by British
Transport Police in an attempt to prevent major vandalism attacks."

Either they were arrested because they might commit a crime, which is
awful, or they were arrested because they had committed a crime -- in
which case why wait until christmas?