At approximately 2125 on July 4th, LAFD, LACoFD, and ANF responded to reports of a brush fire at Foothill Blvd & Sylmar. Arriving units found approximately 3 acres of brush burning uphill. Fireworks could be seen shooting off in the fire prior to LAFD arrival. Firefighters protected one threatened structure and stopped the forward progress. LACoFD and LAFD helicopters made multiple water drops on the fire.