Here’s an outline of how Massachusetts law enforcement plans to keep runners and spectators safe.
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What to Know
- The 129th Boston Marathon -- the world's oldest and most prestigious annual marathon -- was held on Monday
- More than 30,000 runners from around the world competed in the 26.2-mile race
- John Korir of Kenya won the professional men's division, joining his brother, Wesley, as the only siblings ever to win Boston
- Sharon Lokedi of Kenya won the professional women's division, beating out reigning champ Hellen Obiri
Monday was the 129th Boston Marathon, the world's oldest and most prestigious annual marathon. More than 30,000 runners from around the world competed in the 26.2-mile race from Hopkinton to Copley Square.
John Korir of Kenya won his first Boston Marathon in the professional men's division, joining his brother, Wesley, who won it in 2012. Sharon Lokedi of Kenya won the professional women's division in a course record time, defeating defending champ Hellen Obiri, who finished second.
Marcel Hug of Switzerland won his eighth Boston Marathon in the men's wheelchair division, and American Susannah Scaroni won her second championship in the women's wheelchair division.

Many other notable runners competed this year, including NBC10 Boston reporters Malcolm Johnson and Matt Prichard and NBC Sports Boston's Drew Carter.
Read below for live updates from throughout the day: