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SAN DIEGO — A wildfire that broke out in a remote area east of Mount Laguna Saturday morning grew to nearly 350 acres and proved a challenging firefight for crews.

The fire was first reported around 9 a.m. in the Canebrake area, near the Great Southern Overland Stage Route in rural East County, according to Cal Fire San Diego. “The remote location is making access by ground difficult,” the department said as it sent aircraft to douse the flames.

By about 1:30 p.m. the fire was reported at 500 acres, but that figure was reduced to 343 acres a few hours later because of more accurate mapping of the perimeter. The fire was 5% contained, Cal Fire said.

Even as it grew to hundreds of acres, Cal Fire said the blaze was not immediately threatening any buildings, due to the remote location. No evacuations had been ordered as of Sunday, when the work continued.

“Ground access remains difficult,” a spokesperson wrote on Twitter. “Additional Air resources are at scene.”

The fire comes after a week of extreme heat in parts of San Diego County and warnings from officials that the dry conditions would lead to increased fire danger.

This is a developing story. Check back for updates.