Go read the article. There are MANY more like it.
All Boston mass transit was suspended Friday, and the Watertown area was in lockdown until further notice as police hunted for the marathon bombing suspect.
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A sign on I-93 alerts motorists that Boston is under a “shelter in place” order Friday.
http://www.npr.org/2013/04/22/178446136/boston-lockdown-extraordinary-but-prudent-experts-say
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Boston lockdown: Authorities order residents to shelter in place during massive manhunt
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Law enforcement mobilized, sending legions of heavily-armed police officers to search a 20-block area of the community. At the same time, Governor Deval Patrick took an unprecedented security step, asking people in Boston, Watertown, and several other nearby communities totaling a million people to shelter in place stay at home behind locked doors and open up only to police officers with proper identification.
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It was more severe than a curfew