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Fire officials in Washington State are seeking information on people and a vehicle of interest as they investigate a wildfire that grew to 2,000 acres from 150 acres within hours on Sunday, forcing thousands of people to evacuate.

The authorities are trying to identify two men and two women who are believed to be connected with a white or light-colored Subaru seen on a ridge near the fire on Oct. 9, the Clark County fire marshal said in a statement on Monday afternoon. The statement included a video and photo and cited witness statements, but it did not elaborate on the connection.

The fire, called the Nakia Creek fire, is burning on extremely steep ground in the Yacolt Burn State Forest near Camas, Wash., about 20 miles northeast of Portland, Ore. Officials said it was spread over 1,565 acres as of Monday afternoon and was 5 percent contained.