Every years since its inception, the Boston Marathon has been run on Patriots' Day, which commemorates the Battles of Lexington and Concord, marking the beginning of the Revolutionary War.
The race draws at least 30,000 runners from around the world and hosting it during the COVID-19 crisis is "not feasible" this year, Walsh said.
"There's no way to hold this usual race format without bringing large numbers of people into close proximity", Walsh said. "This kind of event would not be responsible or realistic on September 14th or anytime this year".
In 1967, Kathrine Switzer became the first woman to officially run the BostonMarathon.
"Our top priority continues to be safeguarding the health of the community, as well as our staff, participants, volunteers, spectators, and supporters", Tom Grilk, chief executive of the Boston Athletics Association, which manages the Boston Marathon, said in a news release.
Boston Police officers ride past the finish line of the Boston Marathon, which was canceled and replaced with a virtual event on Thursday.
The Boston marathon has been cancelled for the first time in its 124 year history.
There will be no Boston Marathon in 2020.
"For the rime being, we are better off being careful and cautious when it comes to really big events like that", he said. "When necessity drives you in a direction you may not like, you have to have this strength, the wisdom and the guidance from public officials to do what's right".
The B.A.A. said those who paid the entry fee for this year's race can get their money back. The distance can be run any time between September 7 and September 14. The virtual program the BAA will host includes panel discussions, champions interviews and a downloadable toolkit. Participants will be able to get a full refund for their entry fee, and runners will have the opportunity to participate in the virtual marathon any time between September 7 and 14.
Participants in the virtual 2020 Boston Marathon will be required to complete the 26.2 mile distance within a six hour time period and provide proof of timing to the B.A.A. The 125th anniversary edition is scheduled for April 18, 2022.