The Karney fire, which is about 250 acres according to the Associated Press, is threatening up to 100 homes in the Wilderness Ranch area.
Nathanial Bartholomew, 18, has been booked into the Ada County Jail on felony arson charges.
Investigators say Bartholomew is a volunteer firefighter in the Robie Creek area. He also has family who are fighters and apparently wanted to start the fire himself to bring attention to himself. He was spotted fighting the fire when responders arrived.
Officials say a flareup from the Karney Fire ignited early Tuesday morning ---causing additional evacuation orders from Boise County for the Rush Creek Road and the top portion of Evergreen Road areas. Monday's evacuation orders are still in effect along the Robie Creek Road.
One home, which was vacant, has been burned. The fire started around 4:30 p.m. Monday and multiple fire agencies are involved.
The Boise National Forest Service has sent five engines, one bulldozer, and hand crews to the area. There are also helicopters and air tankers responding. (Photos of the Fire >>>)
Fire managers have ordered four more crews. Air tankers and helicopters will be available Tuesday morning to work on the fire, which has been described as challenging. Fire managers are also discussing whether to order a Type 2 incident management team.
The American Red Cross has set up a shelter at Idaho City High School to help with folks affected by the blaze.
Video of the fire from Denise Lemon: