Prosecutors on Thursday summoned the former chief of a scandal-mired nationalist school operator and his wife for questioning in relation to allegations of soliciting fraudulent public subsidies for their businesses.

The criminal investigation into Yasunori Kagoike, 64, former chief of Moritomo Gakuen, and his wife Junko, 60, who served as a senior official for the school operator, follows a scandal over a controversial land deal involving heavily discounted government land for a new school.

The Osaka District Public Prosecutors's Office special investigation squad brought the couple, who have close links to Prime Minister Shinzo Abe, in on Thursday after it received a complaint in March that the school operator unlawfully received state subsidies worth about ¥56 million in relation to the construction project of an elementary school in the city of Toyonaka.