Race officials canceled Sunday's Cellcom Marathon in Green Bay, due to the heat.
Two-and-a-half hours into the race, they told runners to stop, get water and wait for buses to take them to the finish line.
Some runners stopped, but others didn't.
"I saw one runner go down and they had the ambulance there," said race volunteer Barb Konop. "And she was not ready to quit. And it's like, 'Lady, you're going to the hospital.'"
Other runners felt like stopping the race was a good idea.
"I heard a lot of ambulances when I was running," said runner Jessica Merchak, of Waukesha. "So I think for the safety of runners, it was a good idea."
Volunteers drove the race route after the stoppage, to pick up any runners still on the course.
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