TOKYO — Japan's Toyota Motor is planning to recall around four million vehicles in the United States to fix a potential problem affecting their accelerator pedals, a media report said Wednesday.

The move was made due to a risk that loose driver-side floor mats could slip forward and jam the pedals, Kyodo news agency said, quoting sources close to the matter.

The automaker could announce the move later in the day, Kyodo said, in what would be one of the largest recalls by Toyota in the United States.

Last month, Toyota quoted the US National Highway Traffic Safety Administration as saying that it had received reports of 100 related incidents, including 17 crashes and five fatalities involving Toyota vehicles, Kyodo said.