In pics: Largest wildfire in Oregon expands further

The wildfire doubled in size to 6.2 square miles (16 square kilometers), forcing evacuations in the area in in Oregon, US. (Credits: AP)

The lightning-caused Bootleg fire was encroaching on the traditional territory of the Klamath Tribes, which still have treaty rights to hunt and fish on the land, and sending huge, churning plumes of smoke into the sky visible for miles. (Credits: AP)

The Bootleg ranks as the largest by far of 70 major active wildfires listed on Thursday as having blackened nearly 1 million acres in 11 states, the National Interagency Fire Center in Boise, Idaho, reported. (Credits: Reuters)

Helicopter refills on water before flying out to the Bootleg Fire, located 27 miles northeast of Klamath Falls, near Bly, Oregon. (Credits: AFP)

More than 1,700 firefighters and a dozen helicopters were assigned to the blaze, as the demand for personnel and equipment across the Pacific Northwest reached levels that have begun to strain available resources. (Credits: AFP)

Hand crews backed by water-dropping helicopters struggled on Thursday to suppress a huge wildfire that displaced roughly 2,000 residents in southern Oregon. (Credits: AFP)

A firefighting aircraft drops flame-retarding chemicals on the Bootleg Fire in Bly, Oregon, US. (Credits: Reuters)

Firefighter Kerry Boyd ends his shift as the Bootleg Fire expands to over 225,000 acres, in Bly, Oregon, US. (Credits: Reuters)

Oregon firefighters Taryn Thomas, Kenny Picard and Gamari Griffin work on a hotspot on the fire perimeter of the Bootleg Fire, located 27 miles northeast of Klamath Falls, Oregon. (Credits: AFP)

Smoke billows from the Grandview Fire as it rages in Jefferson and Deschutes Counties, in Oregon, US. (Credits: Reuters)