Doubt has been cast over the staging of a 'Grand Prix of America' in 2013 as fears grow that the track in New York will not be ready.
The event is scheduled to become a part of next year's racing calendar, but Formula 1 boss Bernie Ecclestone has admitted that there are no guarantees the new venue will be finished on time.
When questioned about progress on the new track, which will run on public roads overlooking New York City and the Hudson River on the USA's East Coast, Ecclestone was reluctant to confirm anything.
"Maybe the New York race will be 2013. It's a when - 2013 or 2014," he said, less than a week after he was forced to defend plans to allow this year's Bahrain Grand Prix go ahead, amid fears for the safety of the drivers, the crews and the viewing public.
If it does go ahead, the 'Grand Prix of America' would become the second race to take place in the sport-mad nation on the Formula 1 calendar.
Another race, the United States Grand Prix, has been pencilled in as the penultimate race of the 2012 F1 calendar, and will take place in Austin, Texas.
Circuit bosses in the Southern state have also faced questions about progress being made on construction of the track, but insist that the event will go ahead as planned.