The mayor of a city in Shizuoka Prefecture, central Japan, has filed a complaint with police against the head of a nursery over his alleged cover-ups of suspected child abuse cases involving its workers.

The mayor of Susono City, Murata Harukaze, submitted the complaint on Monday against Sakurai Toshihiko, who heads Sakura Hoikuen -- a private nursery school authorized by the local administration.

The governor of Japan's northern prefecture of Hokkaido and the mayor of its biggest city, Sapporo, are united in stepping up preventive measures as coronavirus infections are increasing there again.

Prefectural officials confirmed 75 new cases on Wednesday. Fifty-one of them are in Sapporo. The tally in the prefecture surpassed 70 for the third day in a row.

The mayor of Hiroshima City says the enactment of the UN treaty will be a major milestone on the road to abolishing nuclear weapons.

Mayor Matsui Kazumi noted that nuclear powers and countries under the nuclear umbrella remain opposed to signing and ratifying the treaty. He said making the treaty more effective will be the next challenge.

The mayor of Nagasaki City has repeated his call for the Japanese government to ratify the UN treaty banning nuclear weapons.

Mayor Taue Tomihisa said he wants the government to attend a signatories' meeting as an observer if it is difficult for Japan to ratify the treaty.

The mayor of Tokyo's Shibuya Ward has asked people to refrain from coming to the district to celebrate Halloween this year, to prevent spreading of the coronavirus.

Hasebe Ken made the rare call at a news conference on Thursday ahead of Halloween next Saturday.

The home of a mayor on Japan's northernmost prefecture of Hokkaido has been vandalized as the town debates a plan to host a disposal site for nuclear waste.

Kataoka Haruo, the mayor of Suttsu, notified police before dawn on Thursday that a window of his house was shattered and scorched. The mayor was not hurt.