"GO NOW - Evacuate immediately!" the Marion County Sheriff posted on the social media site X. "Leave without delay. It is unsafe to stay and threatens the safety of you, your family."

Deputies were going door to door to warn people of the fire, the sheriff's department said.

Salem is a city 180,000 people about 50 miles (80 km) south of Portland in the northwestern U.S. state of Oregon.

The fire was south of the city limits, near the interface between densely populated areas and green space.

(Reporting by Daniel Trotta; Editing by Sonali Paul)