Fire crews from Ventura and Los Angeles counties are battling a rapidly growing vegetation fire in Holser Canyon, near Lake Piru, in 100-degree heat. The blaze, called the Canyon Fire, is estimated to be at 1,

LOS ANGELES >> A rapidly growing wildfire straddling the Ventura-Los Angeles county line Thursday afternoon triggered evacuations in and around Piru and Castaic amid a major heat wave that officials warned could foster extreme fire growth and behavior.