Organizers are scrapping plans for an IndyCar race on the streets of Boston.

John Casey, president of the Grand Prix of Boston, told The Boston Globe on Friday that the relationship between promoters and the city isn't working.

The race was scheduled for the Labor Day weekend in the city's Seaport District. Organizers had hoped to construct a temporary street course around the Boston Convention & Exhibition Center.

Mayor Martin Walsh and organizers signed an agreement last May calling for annual races for up to five years.

Opponents argued the race would have negative impacts to the environment and neighborhood safety.

Casey said organizers are hoping to hold the race in a backup city in the Northeast.

He said promoters have had contact with two other cities, one of which is in New England.

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