A firefighter sprays water in front of an advancing wildfire Friday, Oct. 11, 2019, in Porter Ranch, Calif. (AP Photo/Marcio Jose Sanchez)

LOS ANGELES (AP) — Santa Ana winds that drove fires through two Southern California areas have died down but flames that destroyed dozens of homes continue to rage.

A blaze in the San Fernando Valley area of Los Angeles was only 13% contained Saturday after destroying 13 buildings. One man who had tried to fight the blaze died of a heart attack.

The fast-moving fire is keeping tens of thousands of people from returning to their homes until officials are convinced it's safe.

The fire broke out Thursday, just hours after flaming garbage in a trash truck sparked another wind-whipped blaze that ravaged a mobile park in Calimesa, east of downtown Los Angeles.

Several residents of the park were unaccounted for and the family of an 89-year-old woman says they fear she died when her home burned.

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Dazio reported from Los Angeles and Calimesa. Associated Press writers Amy Taxin in Calimesa and John Antczak and Beth Harris in Los Angeles contributed.

Jerry Rowe uses a garden hose to save his home on Beaufait Avenue from the Saddleridge fire in Granada Hills, Calif., Friday, Oct. 11, 2019. (AP Photo/Michael Owen Baker)
A helicopter drops water while battling the Saddleridge fire in Porter Ranch, Calif., on Friday, Oct. 11, 2019. (AP Photo/Noah Berger)
This satellite image from the National Oceanic and Atmospheric Administration (NOAA) shows a plume of smoke from the Saddleridge wildfire streaming out over the Pacific Ocean from the Los Angeles area of Southern California, center right, Friday morning, Oct. 11, 2019. (NOAA via AP)
In this Thursday, Oct. 10, 2019 photo, Los Angeles City firefighters battle the Saddleridge fire near homes in Sylmar, Calif. (AP Photo/Michael Owen Baker)
The Saddleridge fire flares up near a firefighter in Sylmar, Calif., Thursday, Oct. 10, 2019. (AP Photo/Michael Owen Baker)
In this Thursday, Oct. 10, 2019 photo, a firefighter waits for water as the Saddleridge fire flares up near homes in Sylmar, Calif. (AP Photo/Michael Owen Baker)
Los Angeles Police Department Chief Michel Moore tells resident Jerry Rowe that firefighters are coming after the roof of Rowe's home caught fire from the Saddleridge fire in Granada Hills, Calif., Friday, Oct. 11, 2019. (AP Photo/Michael Owen Baker)
A woman evacuates her home with her cat as the Saddleridge fire threatens homes in Granada Hills, Calif., Friday, Oct. 11, 2019. (AP Photo/Michael Owen Baker)
Firefighters recoil from smoke and heat from a fully engulfed house on Jolette Way in Granada Hills North, Calif., early Friday morning, Oct. 11, 2019.  (David Crane/The Orange County Register via AP)
A firefighter rests as crews continue to battle the Saddleridge Fire burning in Porter Ranch, Calif., on Friday, Oct. 11, 2019. (AP Photo/Noah Berger)
A firefighter cuts though a fence to gain access to the Saddleridge fire along Yarnell Street in Sylmar, Calif., Friday, Oct. 11, 2019. (David Crane/The Orange County Register via AP)
Firefighters make a stand on an advancing wildfire from the backyard of a home Friday, Oct. 11, 2019, in Porter Ranch, Calif. (AP Photo/Marcio Jose Sanchez)
A tanker drops retardant on the Saddleridge Fire burning in Newhall, Calif., on Friday, Oct. 11, 2019. (AP Photo/Noah Berger)
Eyed Jarjour, left, comforts a neighbor who lost her Jolette Ave. home to the Saddleridge Fire on Friday, Oct. 11, 2019, in Granada Hills, Calif. (AP Photo/Noah Berger)
A resident surveys the scorched remains of her home and vehicle after the Saddleridge Fire burned through Granada Hills, Calif., on Friday, Oct. 11, 2019. (AP Photo/Noah Berger)
Eyed Jarjour comforts a neighbor who lost his Jolette Ave. home to the Saddleridge Fire on Friday, Oct. 11, 2019, in Granada Hills, Calif. (AP Photo/Noah Berger)
LAPD officers evacuate residents from the Oakridge neighborhood in Sylmar early Friday morning as fire approaches. The fast wind-driven fire spread rapidly from Sylmar to Porter Ranch late Thursday and early Friday morning October 11, 2019 destroying at least three homes. (David Crane/The Orange County Register via AP)