Tokyo Olympics fans may have to be vaccinated or test negative for the coronavirus before being allowed into venues, a Japanese newspaper reported.
Cheering, eating, high-fives and drinking alcohol would also be banned under controls now being considered.
Organizers are set to decide in June how many spectators — if any — will be allowed to attend the pandemic-postponed Games.
Overseas fans are already barred, and the report warned domestic spectators may be denied entrance or kicked out for breaking the rules.
Under the plan, spectators must be able to show a vaccination certificate or a negative test taken at their own expense less than a week before entering the venue.
They must wear masks and fill in health-check sheets, and once inside must not cheer loudly or high-five each other.
Security guards will be stationed around venues monitoring behavior, with public viewing venues cancelled or scaled down.