BROWNING, Mont. (AP) – Blackfeet tribal leaders have joined with environmental groups, other American Indian tribes and the band Pearl Jam to campaign for the cancellation of oil and gas leases near Glacier National Park.

Tribal leaders on Wednesday said they plan to erect billboards to raise awareness and encourage the Interior Department to cancel the 18 leases in the Badger-Two Medicine area.

Tribal historic preservation officer John Murray says the leases are in the vicinity of sites continuously occupied by Blackfeet for thousands of years. The area is the home of the creation story of the four Blackfoot tribes.

Pearl Jam posted a message on Twitter urging its fans to support the tribe’s effort, which has backing from U.S. Sen. Jon Tester.

The leases were suspended in the 1990s. One leaseholder has a pending lawsuit to lift the suspension.