OKLAHOMA CITY (AP) — Federal regulators have shut down 17 wastewater disposal wells in the Osage Nation of northeastern Oklahoma following a weekend earthquake that matched the state’s strongest on record, state officials confirmed Tuesday.

Because the wells are located on tribal land, Oklahoma regulators have no jurisdiction over oil- and gas-producing facilities in the region.

Oklahoma Corporation Commissioner Matt Skinner told The Associated Press that the U.S. Environmental Protection Agency notified the state Tuesday that 17 wells were ordered closed.

“We’ve never had to do anything that directly involved Osage County, but on Saturday (the EPA) were quick to respond,” Skinner said. “They confirmed on Sunday they were going to put that directive in place, and today they gave us the numbers.”

The 17 wells are located in a 211-square mile area within Osage County, near where a magnitude 5.6 temblor struck Saturday. The epicenter was near Pawnee.

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