Google has set up a person finder website for those looking for people following the explosions at the Boston Marathon. Those with information about individuals can also leave information on the site.
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Drivers are being advised to use alternative routes or wait until 8pm before setting off to avoid the worst queues.
Researchers at King’s College London say it is the “first step” in identifying those who could be at risk of contracting the condition.
Theresa May is unlikely to be winding down for Christmas any time soon.