Around 30,000 runners from around the world participate in the annual marathon, which weaves through federal properties in Washington, D.C. that are closed because of the shutdown.
Runners paid $99 to enter this year's Marine Corps Marathon, and entry slots sold out in a matter of hours.
Organizers said they were still working on the details of how to handle a cancellation and now to reimburse entrants if it doesn't take place.
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