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Firefighters were getting the upper hand on a 275-acre brush fire in a remote hill area near Ventura Wednesday, the Ventura County Fire Department said.

The blaze was reported at 5 to 10 acres shortly before 11 a.m. off Foothill Road, between the cities of Ventura and Santa Paula. It was burning along power lines in the area, slowly being pushed by a 5 mph breeze, the Fire Department said.

By 12:30 p.m., it had grown to 50 acres and was still spreading moderately.

The flames has consumed 275 acres before 10 p.m., officials said. Firefighters had managed to build containment lines around 70% of it.

The blaze, dubbed the Elizabeth Fire, sent plumes of smoke billowing over the area as it burned through in the hill area while dozens of firefighters worked to extinguish the flames.

Two firefighters were treated for what the department described as “general illness/exhaustion.”

No structures were threatened.

It’s unclear what sparked the fire. The area was experiencing high temperatures of up to 84 degrees, with much of the region under elevated fire danger.

No further details were immediately available.

KTLA’s Brian Day contributed to this report.