Promoter and rights-holder Dorna Off-Road said it had informed motorsports governing body the FIM about 'serious problems' affecting the organisation of the race, due to take place in Competition Park, San Jacinto on September 28-29.
Said a Dorna Off-Road (DOR) spokesman: "These problems generated uncertainty and confusion over the effective realisation of this event. Therefore, DOR requested the local organiser, Competition Park Motocross Sports Inc, to provide evidence and to confirm that it was still holding all the valid rights, licenses and authorisations in order to organise the event.
"Furthermore, DOR also sought the official position of the United States Department of the Interior, which replied in a letter, indicating that 'the Department believes the motocross project is an illegal operation and has to be shut down'.
"Consequently, DOR indicated that it had no other alternative but to request the cancellation of the Motocross of Nations in San Jacinto, and this was accepted by the FIM Executive Board."
The race will now be rescheduled to take place in Bellpuig, Spain, on October 19-20.
