(CNN) -- A wildfire triggered by an exploding propane tank has consumed 1,000 acres of forest land in the Sierra Nevada Mountains of California near Yosemite National Park, authorities said.
The blaze started around 12:30 p.m. when a propane tank on a recreational vehicle exploded "and quickly spread to nearby vegetation," said Rebecca Garcia, of the Sierra National Forest.
The fire continued to grow and, by the evening, authorities had ordered the evacuation of an area south of a maintenance station at Yosemite National Park.
Officers have set up a roadblock on Highway 140 in that area and Garcia says the evacuation area may be expanded in the morning.
The fire is currently threatening 70 structures and 35 outbuildings.
"We are in full response right now," Garcia told CNN.
She says the priority will be to protect structures. Fire officials say there is a significant chance of growth in the area, which has several canyons with steep walls.
So far, there have been no reports of injuries.