The fires come as San Diego County mountains and valleys, along with other parts of Southern California, remain under a red flag warning.

Firefighters are working to contain a pair of brush fires that broke out along the I-15 Freeway in northern San Diego County early Tuesday morning. The first, called the Pala Fire, was reported at around 12:30 a.

Lilac Fire initially started today at 1:19 a.m. in San Diego County. It has burned 85 acres after being active for 19 hours. A crew of 66 firefighters succeeded in containing 50% of the fire as of Tuesday evening. Investigations into its cause are still ongoing.