Forest Park Mayor Rory Hoskins and other officials are demanding accountability after he said U.S. Immigration and Customs Enforcement agents detained U.S. citizens using excessive force at Concordia Cemetery last week.

This comes after they said four U.S. citizens were wrongfully detained and assaulted by ICE last week as part of "Operation Midway Blitz."

The encounter was at Concordia Cemetery. The Department of Homeland Security said agents were attempting to arrest two undocumented immigrants when the pair crossed into the Des Plaines River, trying to escape.

Hoskins said ICE broke the gate to get into the private property and arrested four employees in the process. Those employees were U.S. citizens, according to Hoskins.

He said the agents used unnecessary physical force, including the use of pepper balls, before detaining them for several hours.

"Their constitutional rights have been violated," he said. "Forest Park is one of many communities right now dealing with ICE and customs officials who are treating members of the community as if they're less than."

DHS told CBS News Chicago the four employees were trying to impede their arrest of the two undocumented immigrants.

Both of those undocumented men were eventually arrested. The four employees were released without any charges.