According to an article by David Leppard, Scotland Yard has uncovered evidence that Al Qaeda operatives were going to blow up Telehouse Europe, a large colocation facility in Britain that is the country's largest Internet hub. Suspects who were recently arrested had conducted reconnaissance against Telehouse and had planned to infiltrate the organization and blow it up from inside.

Part of me doesn't want to take this seriously, but in fact this would likely cause significant economic disruption...

Technology Review: Could Al Qaeda Plunge England into an Internet Blackout?