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A brush fire burning between Ventura and Ojai scorched 50 acres Thursday afternoon, Ventura County Fire Department Capt. Mike Lindbery said.

Flames were spreading from the area of North Ventura Avenue and Casitas Vista Road, which is off of State Route 33, according to the Fire Department.

Traffic on State Route 33 was being diverted to North Santa Ana Road, Lindbery said.

“This is actually a pretty good-sized fire for the time of year,” Lindbery said in live video on Periscope. “This is Southern California in April … another year of drought.”

The blaze, being referred to as a the “Casitas Incident” was roughly a quarter-acre when it was first reported about 2:10 p.m., Lindbery tweeted. Less than an hour later, it had grown to 40 acres and was “moving rapidly east to west.”

At about 5:30 p.m., Lindbery said the perimeter was at 50 acres. The blaze was burning away from structures that had been previously threatened, he said.

By 10 p.m. the fire was 50 percent contained, Lindbery said.

The fire appeared to be burning uphill from State Route 33 in a remote area, and it was unclear if any homes were nearby.

It started about 9 miles south of Ojai along State Route 33.

Cal Fire was assisting the county Fire Department with the response.

A “ladies center” in the Ventura area was among the buildings initially threatened, according to a tweet from Teen Challenge SoCal.

“Please help us pray! There is a grass fire threatening our Ventura ladies center. Everyone is safe & all the ladies have been evacuated,” the tweet stated.

No mandatory evacuations were ordered.

KTLA’s Jennifer Thang contributed to this story.