On Thursday night, the Kenneth fire was being investigated as a possible arson, and a person of interest was detained, officials said. The fire grew quickly to engulf 960 acres near Victory Boulevard west of Gilmore Street and was headed south towards Hidden Hills, fire officials said early Thursday evening.

A fast-moving wildfire that broke out 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.