A brush fire north of Los Angeles ignited on Thursday, spreading rapidly to more than 4.1 square kilometers within three hours. About 4,200 residents and 1,400 structures in Los Angeles County are under evacuation orders, with another 12,500 residents under evacuation warnings.

This blaze follows the massive Gifford Fire in Central California, now the largest wildfire in the state this year. It has burned about 399 square kilometers, is 15 percent contained, and has injured at least four people.