j823777 was one of several readers to point out a BBC report that "A terrorist plot to blow up planes in mid-flight from the UK to the U.S. has been disrupted, Scotland Yard has said. It is thought the plan was to detonate up to three explosive devices smuggled on aircraft in hand luggage. Police have arrested 21 people in the London area after an anti-terrorist operation lasting several months. Security at all airports in the UK has been tightened and delays are reported. MI5 has raised the UK threat level to critical — the highest possible." spo0nman adds a link to the Associated Press's coverage. Update: 08/10 12:57 GMT by T : Several readers have pointed out new restrictions imposed as a result of this plot on passengers' carry-on luggage. In the UK, nearly all possession (including laptop computers) must be carried in the cargo hold; while their rules don't yet go quite as far, U.S. airlines are stepping up their enforcement of carry-on-restrictions, including banning substances like toothpaste.