The Boston Marathon disqualifies 13 runners from the Edmonton Marathon for Boston qualifiers. Organizers reduced times to account for a course 674.7 meters too long. The Boston Athletic Association only accepts unadjusted official times.

Edmonton organizers announced the split, with 92 other qualifying times accepted. The error stemmed from a route detour around Wellington Bridge. Runners posted GPS files contradicting organizers' measurements. Read more racing coverage.

Certified courses must meet World Athletics and AIMS rules. Edmonton's overage was about 16 times the standard cushion. Runners need a new qualifying time from a certified marathon. Related: Eilish McColgan Returns to Big Half After Injury.

This original Runner World brief is based on reporting from Marathon Handbook. Visit the source for its complete reporting, context and any later corrections.