Containment of a brush fire that erupted in the West Hills area and consumed 1,052 acres in Los Angeles and Ventura counties increased from 50% to 80% Saturday, with the spread of the flames halted.

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 960-acre brush fire sparked in the West Hills area near the 101 Freeway Thursday afternoon. The Los Angeles Fire Department said that the fire was quickly burning toward the south, relatively close to homes before they were able to establish perimeter lines.