The Whitman County Sheriff's Office told KHQ Local News reporter Liz Burch that some campers may have accidentally started the Snake River Fire.
Deputies say they are still trying to determine an exact cause, but witnesses told them two men in their 20's were camping in the area where the fire started.
Firefighters in Whitman Co. say all evacuations caused by the fire have been lifted as of Wednesday morning.
Previous Coverage: Fire mobilization has been approved by Washington Emergency Management for a fire in Whitman County that is growing fast.
The Snake River Fire, originally called the Wawawai Canyon Fire, burning near Colton is estimated to be 11,000 acres as of Tuesday night and growing fast. According to Pullman Radio News, at least one structure has burned and another is threatened. With the winds high, firefighters are working to save structures and not engaged the fire at this time.
Park Rangers are en route to campgrounds in the area to evacuate people. Volunteers from Colfax, Albion, Colton, Uniontown and others are on scene with Whitman County Fire District #12 running the command.