DETROIT (WWJ) – The discovery of contaminated soil and groundwater at Detroit’s Riverside Park has forced the city to temporarily close it.

Tests showed a petroleum-like substance in the ground.  The 20-acre park is near the Ambassador Bridge.

Detroit Free Press reports recreation officials are reassuring residents that the park closure is not a precursor to giving it to the Detroit International Bridge Company. The company has been trying for years to restrict access to the park for security reasons.

Officials said the park could be closed for months.