Santiago Fire deliberately started in two places , official says . Witnesses told police they saw him lighting a fire on a hillside in the West Hills area of San Fernando -- northwest of Los Angeles -- then walking away , Lopez said . Score: 6 L.A. authorities investigate man arrested for suspected arson . Blaze has destroyed 22 structures .
Santiago Fire deliberately started in two places , official says . Score: 6 L.A. authorities investigate man arrested for suspected arson . Blaze has destroyed 22 structures .