Latest news: http://news.bbc.co.uk/sport2/hi/motorsport/14431691.stm

Rumors of "sabotage"
Is that the reason for contacting the Police...

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The news article from the BBC link above has now been updated with.

"A mixture of oil and diesel was found on the circuit and it is believed that the damage may have been caused deliberately"

Bomb scares at the North West. Now there's scum bags pouring oil and diesel on public roads at night endangering riders lives nevermind the public. What the hell is going on?