The 118th running of the Boston Marathon has begun amid heavy security a year after the bombings near the race's finish line that killed three people and wounded more than 260 others.
Massachusetts Gov. Deval Patrick said at the starting line in Hopkinton that officials are trying to keep a traditional family feel to the marathon while maintaining tight security.
A moment of silence was observed and "America the Beautiful" was played over a loudspeaker before the start of the race.
About 36,000 runners registered for the race - the second-largest field in its history.
You can track runners in the race at the Boston Marathon website.
If you go to the search page, you can even search by state. To find the runners from South Dakota taking part, type in 'SD' for the state option. It lists 35 runners taking part from the state.