https://www3.nhk.or.jp/news/html/20200910/k10012610231000.html
https://www3.nhk.or.jp/news/html/20200910/k10012611691000.html
https://jp.reuters.com/article/tokyo-coronavirus-down-idJPKBN2610K7
https://news.yahoo.co.jp/articles/efa73b15332d4d503f43ea8e57dc0db854f23a96