ALTON, Ill — On Wednesday morning, a 100-foot-wide, 50-foot-deep sinkhole opened up on the soccer fields at Gordon Moore Park in Alton, Illinois, above a mine owned by New Frontier Materials. Luckily, no one was hurt, but it’s causing a major headache for city and state officials.

Illinois Governor J.B. Pritzker called on the U.S. . Department of Labor’s Office of Mine Safety and Health Administration to address the effects of the sinkhole and the collapse is now under their jurisdiction. Residents are voicing their concerns over their safety and beginning to demand answers.

Judy Johnson, a Madison County resident, said, “It would be nice, you know, if they could explain how it happened or why it happened… why [the park] was even developed.”

Alton mayor David Goins stated in a press release Thursday, “The safety of our citizens is our utmost priority. We are working diligently with New Frontier Materials and MSHA to ensure that all necessary measures are taken to address this issue promptly and effectively. The impacted area will remain off-limits until thorough inspections are completed and the grounds are deemed safe for public use.”

The Illinois Department of Natural Resources and the Illinois Emergency Management Agency will be supporting MSHA with the investigation.

Spokesman Matt Barkett from New Frontier Materials also said in a press release Thursday that all operations on the site have halted, and geological experts from both MSHA and New Frontier Materials are conducting comprehensive inspections.

The Alton Parks and Recreation Department told Fox 2 that Gordon Moore Park will be closed throughout the weekend and they’re not sure about next week’s status. They’ve relocated some programs, such as the day camp, to the riverfront park splashpad and offered alternative locations or refunds for any current park reservations. The city and mining company said an official press conference will be held at a later date, with details yet to be announced.