AUSTIN: Work on the purpose-built circuit that was to host the US Grand Prix from 2012 has been halted in a dispute among developers, Formula One and promoters that has put the race in doubt. As the Circuit of the Americas issued a statement on Tuesday confirming construction had been halted, the project was dealt another blow as Texas state comptroller Susan Combs said in a statement that $25 million in state money for the event won't be paid in advance. A statement issued by the circuit said construction would be halted "until a contract assuring the Formula One United States Grand Prix will be held at Circuit of The Americas in 2012 is complete." "The race contract between Formula One and Circuit of The Americas has not been conveyed to Circuit of The Americas per a previously agreed upon timetable," the statement added.