May 22, 2015
BOSTON (AP) - Some 36,000 runners are expected to participate in today's Boston Marathon. It'll be the second-largest field in its history.
Many people are coming to show support for an event that last year was rocked by two bombs near the finish line, killing three people and wounding more than 260 others.
This year, there are considerably more police, and more than 100 cameras have been installed along the 26.2-mile course, from Hopkinton to Boston's Copley Square.
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