A wildfire burning in City Creek Canyon is expected to burn for at least the next day or so, fire authorities said.
The City Creek fire had torched approximately 150-acres of grass and sage by Tuesday afternoon, and firefighters had given no estimate of when it would be contained.
Air tankers, helicopters and fire crews were scrambling to get to the remote site of the blaze as huge columns of smoke churned into the skies above Salt Lake City. No evacuations from nearby homes have been ordered, although the fire is burning close to some radio towers.
The fire was first reported about 2:30 p.m. Tuesday, sending firefighters from Salt Lake and Davis counties scrambling to reach the remote site as smoke and flames moved steadily up the canyon.
"We don't know what caused it," said Salt Lake City Fire spokesman Scott Freitag. "There's been no lightning today. We assume it's human. There are a lot of trails in that area."
Aerial images showed the blaze churning up a mountainside, torching dry brush in an area barely accessible by bike path. The fire is burning some distance up the canyon, but not too close to homes and other structures in the canyon. The fire originated on private land, U.S. Forest Service spokeswoman Kathy Jo Pollock said.
"There's no time on containment," she said. "This is probably going to burn for a day or two."
The City Creek fire is one of several burning right now in Utah. The Davis fire is burning about four miles south of Terra, in Tooele County. That fire is approximately 110 acres in size and was sparked by lightning.