Tokyo marks 100 days to go until Olympics amid Covid spike

Tokyo marked 100 days to go until the postponed Olympics on Wednesday amid lingering uncertainty over whether the Games can be staged safely amid the Covid-19 pandemic.

The Olympic host city has been under a month-long semi-state of emergency over the pandemic since Monday amid a growing number of new infections.

"During this period, we will put our efforts to prevent the spread of infections and beat the coronavirus, and would like to be able to hold the Games with everyone," Tokyo Governor Yuriko Koike said at an event marking the occasion, DPA reports.

Tokyo confirmed 510 new daily infections on Tuesday, exceeding 500 cases for the first time in three days, while the western prefecture of Osaka reported a record 1,099 cases amid the rapid spread of new variants of the virus.

Speaking at a lower house committee, Shigeru Omi, who chairs the government's coronavirus advisory panel, confirmed "the fourth wave" of coronavirus infections.

The roll out of Covid-19 vaccines has been extremely slow since its start in mid-February. Only 0.4 per cent of the population has been fully vaccinated, according to the Ministry of Health, Labour and Welfare.