Why the police had reason to be jittery yesterday

The Herald reports:

The two devices found in an office at Tufts-New England Medical Center and attached to the Longfellow Bridge yesterday morning were not the marketing devices that sparked a daylong panic in Boston, but simulated pipe bombs, police officials said last night. ...

Via Carpundit, who knows many of the cops trying to secure all those devices yesterday:

... It seems the police really didn't know what they were up against. Call me crazy, but if I were on the bomb squad, I'd treat every device as an explosive until I knew it wasn't.