Several members of the New York City Police Department Bomb Squad are in Boston today to aid security efforts as runners take part in the 118th Boston Marathon.
Rita Jeptoo won for the women, beating the course record by almost two minutes.
That makes Jeptoo a four-time winner of the race.
Bizunesh Deba, a runner based out of the Bronx, came in second and also beat the previous course record.
American Meb Keflezighi won for the men - the first time an American has won since 1983.
Keflezighi held off Wilson Chebet and another Kenyan runner for the win.
More than 26,000 people took part in the race.
That's the second largest group in the marathon's history
The mobility impaired division was the first to hit the course, starting at just after 9 a.m., followed by the elite women, the elite men and the first wave of runners.
About 3,600 police officers kept watch over the 26.2 mile route.
New security measures were in place for this year's marathon.
Runners attending the event used clear plastic bags for their belongings.
Fans hoping to watch near the finish line were urged to leave strollers and backpacks behind.
Three people were killed and more than 260 others were injured when two pressure cooker bombs went off near the race's finish line last year.
Suspected bomber Dzhokhar Tsarnaev is awaiting trial on federal charges and could face the death penalty if convicted.
Meanwhile, Lincoln Center hosted a community viewing of the marathon in one of its media centers on Monday.
Those who went to watch say the event was poignant and helped provide a sense of unity with runners on and off the course in Boston.
"It's amazing to see the whole city come together, the runners come back, you know, bigger, better, stronger than ever, so it means a lot, it's emotional I think, for many of us," said one viewer.
"Just to be part of the running community here, which is a very strong community with the New York Road Runners, to be able to watch it with other people who are passionate about the sport is much better than watching it at home alone," said another viewer.
The marathon itself attracted about a million spectators in Boston.