'Airlines terror plot' disrupted
A plot to blow up planes in flight from the UK to the US and commit "mass murder on an unimaginable scale" has been disrupted, Scotland Yard has said.
It is thought the plan was to detonate explosive devices smuggled in hand luggage on to as many as 10 aircraft.
Police are searching premises after 21 people were arrested. Home Secretary John Reid said they believed the "main players" were accounted for.
High security is causing delays at all UK airports.
The threat level to the UK has been raised by MI5 to critical after the arrests in London, High Wycombe and Birmingham.
Critical threat level - the highest - means "an attack is expected imminently and indicates an extremely high level of threat to the UK".
Three US airlines are believed to have been targeted.
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