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Overseas spectators would not be allowed to enter Japan during the Games and the decision on local spectators, which was originally scheduled to be made at the end of April, will have to be made in June.
Coe said he was planning to launch a campaign to protect the long-term future of athletics when the global lockdowns and cancellations end.
The Diamond League was forced to cancel events in London, Zurich and Rabat due to the COVID-19 pandemic and announced a new calendar on Tuesday with the first event provisionally set for Monaco in August.
Qualification would restart on December 1, subject to the global situation returning to normal, and continue until the end of May for the marathon and 50 kilometre race walk or June next year for all other events, it said.
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