Police clear area around finish line of 2013 Boston Marathon
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Boston Marathon explosions: 'Everyone panicked'

Two people have been killed and 23 injured after two explosions at the finish line of the Boston Marathon, police say.

The blasts shattered the carnival atmosphere of one of the biggest sporting events in the US, causing panic and confusion.

A third explosion occurred at the JFK Library in the city, Boston police have confirmed.

Mark Mardell reports.

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