FLAGSTAFF, Ariz. (AP) — People in the deserts of Arizona flee to the White Mountains when the triple-digit heat is too much to bear, cooling off in the forest a few hours away. That worries a Native American tribe that calls the area home, as coronavirus infections and temperatures have both spiked in one of the hardest-hit states.

The White Mountain Apache Tribe is taking some of the most drastic actions in Arizona to protect its 13,500 residents, more than one-eighth of whom have already tested positive for COVID-19. It's taking cues from severe measures imposed by other tribes nationwide, i...