It's the 121st running of the Boston Marathon. Follow along with our coverage of the more than 32,000 people who are hoping to make it the entire 26.2 miles.
12:11pm: Geoffrey Kirui wins the men's Boston Marathon race.
11:57am: We have a winner: Edna Kiplagat from Kenya just crossed the finish line. Her unofficial time is just under 2 hours and 22 minutes.
11:40am: Our photographer Meredith Nierman caught a symbolic moment about two hours into the race. Bobbi Gibb and Dave McKenzie won the marathon 50 years ago. Gibb's win wasn't official as she wasn't allowed official entry into the race.
11:15am: Wave four takes off.
Manuela Schar of Switzerland wins the #BostonMarathon in the women's wheelchair division, setting a new world record in the process pic.twitter.com/HPUOa0xUvB— Chris Villani (@ChrisVillani44) April 17, 2017
10:50am: Manuela Schar wins push-rim Women's Wheelchair Race, breaking the course record. Wave Three takes off.
WOW! Thrilling finish to men's wheelchair race in #BostonMarathon . New course record for Marcel Hug pic.twitter.com/Y1J9ZF10wm— Jim Harrington (@jejharrington) April 17, 2017
href="https://t.co/HPUOa0xUvB">pic.twitter.com/HPUOa0xUvB— Chris Villani (@ChrisVillani44) April 17, 2017
10:38am: Marcel Hug wins his third straight Men's Wheelchair Race, setting a new course record with a time of 1:18:04.
They're off and running here in Hopkinton. @wgbhnews pic.twitter.com/cReW68xRH5— Phillip W.d. Martin (@phillipWGBH) April 17, 2017
10:25am: Wave two takes off.
2nd wave is off from Hopkinton, as sidewalks start to fill up here on Boylston, and the sun breaks through the clouds. Getting hot. pic.twitter.com/jmHzdAuOrY— Steve Annear (@steveannear) April 17, 2017
10:00am: The Elite Men and Wave One runners take off!
9:32am: Before taking off herself, Kathrine Switzer fires off the gun to start the Elite Women's race.
9:25am: Fifty years after her groundbreaking run, Kathrine Switzer is again making the trip from Hopkinton to Boylston Street at the age of 70. Her run in 1967 was groundbreaking because she was able to get a bib and run officially. The year before, Bobbi Gibb completed the marathon but didn't have a number.
9:19am: Women's Push-Rim Wheelchair race begins.
9:17am: Men's Push-Rim Wheelchair race begins.
8:50am: And they're off!
8:32am: The participants have been waiting to get started for a while. About two hours ago they began boarding buses for the starting line. The Boston Athletic Association, the organization behind the marathon, captured some footage.
Bus loading is under way! pic.twitter.com/UJne0tzH1V— Boston Marathon (@bostonmarathon) April 17, 2017
8:30am: It's about 64 degrees in Hopkinton right now as the competitors wait for the gun to go off. That's warm for a marathon, and it's only going to get warmer. The first wave will be mobility impaired runners. They'll start at 8:50. Next, will be the elite women runners, who will kick off the race at 9:32. The elite men start at 10.
