On Tuesday, firefighters from two departments battled a brush fire between the Plaza Bonita Mall and Interstate 805, the same area where a two-alarm fire sparked last April.
The California Highway Patrol issued a Sig Alert in National City. Several lanes of northbound I-805 were blocked by emergency vehicles.
The blaze started around 11:30 a.m. Tuesday in a riverbed between the mall and the freeway.
Firefighters had trouble accessing the flames because of heavy brush and requested a helicopter to make water drops. White smoke could be seen for miles.
Crews had the fire under control by 1 p.m. No homes are threatened, and no injuries have been reported.
National City Fire, San Diego Fire-Rescue, National City Police and CHP responded. Fire investigators are looking the cause.