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Tight security for "Boston Strong" marathoners

/ CBS News

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Andrew Burton/Getty Images
Massachusetts State Police stand guard prior to the start of the Boston Marathon in Hopkington, Massachusetts. Today marks the 118th Boston Marathon; security presence has been increased this year, due to two bombs that were detonated at the finish line last year, killing three people and injuring more than 260 others.

All photos taken on April 21, 2014.

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Andrew Burton/Getty Images
Law enforcement officials, media, runners, administrators and volunteers mill about prior to the start of the Boston Marathon.

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Andrew Burton/Getty Images
A couple huddles while waiting to load a bus to take them to the start of the Boston Marathon.

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Andrew Burton/Getty Images
Runners prepare ahead of the marathon.

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Andrew Burton/Getty Images
Runners prepare ahead of the marathon.

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Andrew Burton/Getty Images
A runner with a temporary Boston Marathon tattoo gets ready to run the 118th Boston Marathon.

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Andrew Burton/Getty Images
Police officers monitor runners waiting to take the bus.

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Andrew Burton/Getty Images
Runners eat a last meal before loading a bus to take them to the start of the Boston Marathon

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Andrew Burton/Getty Images
Police officers monitor runners getting ready to run.

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Andrew Burton/Getty Images
A couple huddles while waiting to load a bus.

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Andrew Burton/Getty Images
Runners wait in line for a bus to take them to the start of the Boston Marathon.

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Andrew Burton/Getty Images
Transit police officers patrol the MBTA Hynes Convention Center station.

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Andrew Burton/Getty Images
A Military Police officer stands guard.

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Andrew Burton/Getty Images
People bow their heads during a moment of silence.

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Andrew Burton/Getty Images
People bow their heads during a moment of silence.

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Andrew Burton/Getty Images
A father carrying his son on his shoulder watches the scene at the starting line.

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Andrew Burton/Getty Images
A Massachusetts State Police officer stands guard.

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Dominick Reuter/ Reuters
Athletes make their way past security before the 118th running of the Boston Marathon.

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Greg M. Cooper/USA Today
Boston police officers part of the K-9 unit patrol Boylston Street near the finish line before the start of the 2014 Boston Marathon. 

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Greg M. Cooper/USA Today
Supporters hang a Boston Strong banner.

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The Elite Women's division starts the 118th Boston Marathon.

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Jim Rogash/Getty Images
Rita Jeptoo of Kenya crosses the finish line to win the 118th Boston Marathon.

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Jim Rogash/Getty Images
Rita Jeptoo of Kenya celebrates after winning the 118th Boston Marathon.

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Jared Wickerham/Getty Images
Meb Keflezighi of the United States crosses the finish line in first place to win the 2014 Boston Marathon.

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Jim Rogash/Getty Images
Meb Keflezighi celebrates after winning the 118th Boston Marathon.
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