BILLINGS, Mont. (AP) — U.S. officials on Tuesday announced the cancellation of the final two oil and gas leases in a wilderness area bordering Glacier National Park that's sacred to the Blackfoot tribes of Montana and Canada, more than three decades after the tribes said the leases were illegally sold.

Lease owners in Nebraska and Texas were notified of the cancellations in a letter from Deputy Interior Secretary Michael Connor and offered refunds of about $30,000 each.

The move is subject to a potential court challenge. A lawsuit against another lease cancellation in the area last year is pen...