Firefighters have been using a helicopter against the Thompson fire, which has led to evacuation orders in Butte County, California.Footage released by Cal Fire shows their helicopter in action at the dam on Northern California’s Lake Oroville.The Thompson fire started on July 2 and had burned 2,995 acres by Tuesday evening, Cal Fire said.Evacuation orders were issued in Butte County.Local media reported that 230 structures in the area were threatened by the flames. Credit: Cal Fire via Storyful