MINNEAPOLIS — A Hennepin County judge has ordered activists suing the city of Minneapolis over a proposed downtown park to post a $10 million surety bond.

Judge Mel Dickstein said Friday the plaintiffs must post the bond before next Thursday.

One of the plaintiffs, Paul Ostrow, said that won’t be possible, and they are exploring their appeal options.

The group had argued that only the city’s Park and Recreation Board has the authority to own and operate a park. The park would be adjacent to the new Vikings stadium, which is the centerpiece of a $400 million development deal.

The city says the lawsuit was threatening the entire project. They requested the surety bond to cover any losses if the lawsuit fails.