World Watch

IAN WALDIE/GETTY IMAGES

CHECK-IN: British armored patrols near Heathrow Airport

EUROPE
States of High Anxiety
Alert, not alarmed," may be the mantra of certain Western governments, but for their citizens, it's becoming increasingly difficult to stay calm amid ominous warnings, massing police and arrests in the U.K. and Germany.

In the U.S. the terrorism- alert level remained at "orange" — the second-highest — and warnings of possible al-Qaeda attacks sent people on panicky shopping runs to assemble survival kits — and purchase plastic sheeting and duct tape to seal windows in case of a chemical attack.

Most European nations don't color-code their anxiety, but the threat...

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