CHICAGO (AP) — The agency that oversees mass transit in the Chicago area filed another lawsuit Friday against Kankakee, the latest volley in a legal battle over that city’s effort to attract businesses with tax incentives that the Regional Transportation Authority contends are costing it tens of millions of dollars.

In a news release, the RTA, which relies on sales taxes for funds, said it has filed a lawsuit in Cook County alleging that Kankakee is violating the state’s open records law by refusing the RTA’s requests for records of any agreements that Kankakee “has with companies engaging in these schemes.”