The department said on X, formerly Twitter, that crews were conducting “proactive fire operations” so they could protect the containment lines that had been set up around the growing Valley Fire. Boise Fire said it appreciated the “concerned calls” but wanted to assure residents they weren’t seeing a change in the fire’s behavior toward the city.

Residents react to the Valley fire burning thousands of acres in the Boise foothills. The huge plumes of smoke are visible from across the Treasure Valley.