UPDATED thruout: A fast-moving wildfire that broke out earlier Thursday afternoon near West Hills, northwest of Los Angeles, on the border of L.A. and Ventura counties has charred 960 acres and briefly forced mandatory evacuations.

The fire, called the Kenneth Fire, was first spotted at about 2:30 p.m. north of the Ventura (101) Freeway near Valley Circle Boulevard. It was initially reported at 50 acres, and had burned 960 acres by 5:30 p.m., pushed by relentless Santa Ana winds.

There are no immediate reports of injuries or structural damage.

A mandatory evacuation order was issued initially for an area between Vanowen and Burbank Boulevard, from County Lane Road east to Valley Circle Boulevard, but shortly before 5:30 p.m., the mandatory order was reduced to an evacuation warning, according to the Los Angeles Fire Department.

Evacuation warnings that were issued for an area bordered by Ingomar and Saticoy Streets south to Burbank Boulevard, from Valley Circle Boulevard east to Woodlake Avenue, have been lifted

A red flag warning is in effect until 6 p.m. Friday in Los Angeles and Ventura counties.