The organization that unsuccessfully tried to bring an IndyCar race to Boston has filed for bankruptcy, saying it has almost $9 million in liabilities and remaining assets of about $60,000.

Boston Grand Prix said in its bankruptcy filing Tuesday that its liabilities include more than $1.5 million owed to people who bought tickets for the race, which was supposed to be held over the Labor Day weekend.

The tickets went on sale in March, and the race was canceled in April with organizers saying the city was making unreasonable demands. City officials, in turn, said the organizers were disorganized.

Creditors include several former sponsors of the race and the national IndyCar organization, which says it is owed $4.2 million.

Boston Grand Prix said it filed for bankruptcy with "deep regret."