The fire broke out Thursday night and quickly grew out of control in the city of Sylmar, driven by low humidity and gusts known as the Santa Ana winds. About 1,000 firefighters, backed by water-dropping helicopters and planes releasing fire retardants, fought the blaze that forced the shutdown of several major highways. The metro line in the area was also closed, as were schools and businesses. The blaze destroyed 76 homes and buildings, and killed an 89-year-old woman who was unable to escape the flames.