BREVARD COUNTY, Fla. — A Brevard County brush fire is now mostly contained after threatening homes and a horse rescue farm near Port St. John.

• Port St. John brush fire now mostly contained, says firefighters
• Fire grew to 300-acres near a horse rescue and homes
• FHP says it's believed a car fire hours earlier led to the fire

Firefighters have been working for hours to contain the 300-acre wildfire just west of Interstate 95, near Golfview Avenue and Flora Vista Place. Hidden Acres Rescue for Thoroughbreds is in the neighborhood.

As of 9 p.m. Wednesday, the fire is 90 percent contained. Firefighters said crews will monitor the brush fire throughout the night, making sure no hot spots flare up and threaten nearby structures.

Florida Highway Patrol says it's believed a car fire hours earlier led to the brush fire.

Suzanna Norris of Hidden Acres said the flames were coming towards her farm from two directions, and it was so close she could hear it crackling.

“ ... we were ready to leave at a moment’s notice, just kind of monitoring, keeping a close eye on things. And even though things have definitely calmed down, we’re still going to monitor through the night to make sure the horses are good,” she told Spectrum News.

Authorities shut down Challenger Memorial Parkway (State Road 407) in both directions between State Road 528 and I-95. It will stay closed throughout the night due to visibility concerns, FHP said in a tweet.