In pictures: The 118th Boston Marathon

A soldier in the National Guard with a "Boston Strong" flag cheers on runners as they finish the Boston Marathon on Monday in Boston, Massachusetts, USA. Security presence was 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. Andrew Burton / Getty Images / AFP / April 21, 2014

Rita Jeptoo of Kenya crosses the finish line to win the 118th Boston Marathon on Monday. Jim Rogash / Getty Images / AFP / April 21, 2014

The second wave of runners make their way down Main Street during the 118th running of the Boston Marathon in Hopkinton, Massachusetts, USA on Monday. Some 36,000 athletes ran in the 118th Boston Marathon in the first running of the race since last year's bombing attack, to form the second-largest field in the race's history. Dominick Reuter / Reuters / April 21, 2014

Kyle Marshall, of Phoenix, Arizona, USA collapses at the finish line of the 118th Boston Marathon on Monday. Elise Amendola / AP / April 21, 2014

Kenya's Rita Jeptoo reacts after winning the women's division at the 118th Boston Marathon on Monday. Gretchen Ertl / Reuters / April 21, 2014

Spectators cheer as Meb Keflezighi, an American, wins the Boston Marathon on Monday. Andrew Burton / Getty Images / AFP / April 21, 2014

Runners wait for the start gun at the beginning of the Boston Marathon on Monday in Hopkinton, Massachusetts, USA. Andrew Burton / Getty Images / AFP / April 21, 2014

Runners place their hands over their hearts during a singing of the US national anthem at the beginning of the Boston Marathon on Monday in Hopkinton, Massachusetts. Andrew Burton / Getty Images / AFP / April 21, 2014

A police officer is seen as runners go by at the starting section of the 118th Boston Marathon in Hopkinton, Massachusetts, USA on Monday. Justin Lane / EPA / April 21, 2014

Meb Keflezighi of the US reacts after winning the men's division of the 118th Boston Marathon in Boston, Massachusetts, USA on Monday. Keflezighi became the first US male athlete to win the Boston Marathon in three decades, an emotional performance in a city still recovering from last year's fatal bombing attack on the world-renowned race. Brian Snyder / Reuters / April 21, 2014

Images from Monday’s 118th running of the Boston Marathon, an emotional event in the city a year after the race was marred by a bombing that killed three and injured over 260 others.