Around 80 percent of the nation's mayors oppose or remain wary about shifting the start of the school year to September from April, a recent survey shows.

The proposal emerged in the wake of Prime Minister Shinzo Abe's unilateral request for schools to close in late February to curb the coronavirus pandemic.

The mayors say the government should instead concentrate on preventing the virus from spreading, according to the survey, which was conducted by the Japan Association of City Mayors.