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119th running of the Boston Marathon

Men's division winner Lelisa Desisa of Ethiopia and women's division winner Caroline Rotich of Kenya pose with the trophy at the finish line of the 119th Boston Marathon in Boston
Men's division winner Lelisa Desisa of Ethiopia (L) and women's division winner Caroline Rotich of Kenya pose with the trophy at the finish line of the 119th Boston Marathon in Boston, Massachusetts April 20, 2015. REUTERS/Brian Snyder TPX IMAGES OF THE DAY (REUTERS)
Lelisa Desisa, of Ethiopia, kisses his hands after crossing the finish line to win the men's division of the 119th Boston Marathon in Boston
Lelisa Desisa, of Ethiopia, kisses his hands after crossing the finish line to win the men's division of the 119th Boston Marathon in Boston, Massachusetts April 20, 2015. REUTERS/Gretchen Ertl (REUTERS)
An ATF canine unit inspects a bag near the Boston Marathon start line in Hopkinton
An ATF canine unit inspects a bag near the Boston Marathon start line in Hopkinton, Massachusetts, April 20, 2015. A field of 30,000 runners is set to line up for the 119th running of the world's oldest annual marathon. REUTERS/Dominick Reuter (REUTERS)
Runners in the first wave make their way down the course of the Boston Marathon in Hopkinton
Runners in the first wave make their way down the course of the Boston Marathon in Hopkinton, Massachusetts, April 20, 2015. A field of 30,000 runners is set to line up for the 119th running of the world's oldest annual marathon. REUTERS/Dominick Reuter (REUTERS)
A child with an umbrella passes by a window painted with "Boston" near the Boston Marathon start line in Hopkinton
A child with an umbrella passes by a window painted with "Boston" near the Boston Marathon start line in Hopkinton, Massachusetts, April 20, 2015. A field of 30,000 runners is set to line up for the 119th running of the world's oldest annual marathon. REUTERS/Dominick Reuter (REUTERS)

BOSTON (Reuters) - Tens of thousands of runners, including some of the world's best, crowded into Boston on a cold, lightly rainy Monday for the 119th running of the Boston Marathon.

Security was high near the start line in Hopkinton, along the 26.2 mile (42.16 km) course and around the finish line in Boston, in recognition of the bombing of the 2013 race, which killed three people and injured 264 in the one of the most visible attacks on U.S. soil since Sept. 11, 2001.