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Heavy police presence for 2015 Boston Marathon

Around 30,000 runners are lacing up Monday morning for the Boston Marathon, one day before the trial of convicted bomber Dzhokhar Tsarnaev enters the sentencing phase. Miles of fencing have been installed to separate runners from fans, and police will be patrolling the entire course. Don Dahler reports from the marathon's starting line in Hopkinton, Massachusetts.
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