LAUSANNE, Switzerland — The IOC says it remains in contact with French prosecutors following allegations of a secret $1.5 million payment made during Tokyo’s winning bid for the 2020 Olympics.

The British newspaper The Guardian reported on its website Wednesday that the Tokyo bid team paid about 1.3 million euros ($1.48 million) to the Black Tidings bank account in Singapore. It said the account is linked to Papa Massata Diack, the son of disgraced former IAAF President Lamine Diack.

French prosecutors confirmed in March they had widened their investigation into IAAF corruption to include Olympic bidding.

The International Olympic Committee says it has been in touch with French magistrates from the start and is a civil party to the investigation.

The IOC says its chief ethics officer “will continue to be in contact with all interested parties to clarify any alleged improper conduct.”