It has been one year since twin bombs exploded near the finish line of the annual Boston Marathon, killing three people and injuring more than 260 others.
ພາບຈາກພິທີຄົບຮອບ ການວາງລະເບີດຢູ່ບອສຕັນ

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Roses hang on a lamp post near the site of the second bomb blast on the one-year anniversary of the Boston Marathon bombings iN Massachusetts, April 15, 2014.

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Kevin Brown puts up a handmade memorial for victims of the 2013 Boston Marathon bombings near the race's finish line in Massachusetts, April 15, 2014.

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Family members of the victims of the 2013 Boston Marathon bombings are joined by Massachusetts Governor Deval Patrick (wearing a baseball cap, left) and Boston Mayor Marty Walsh (3rd right) as they walk to the finish line, April 15, 2014.

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Security personnel walk across the Boston Marathon finish line prior to a remembrance ceremony for family members and survivors of the 2013 Boston Marathon bombing, on Boylston Street, April 15, 2014.