Firefighters stopped the spread of a brush fire burned four acres in the Otay River Valley in Chula Vista overnight.
Two firefighting helicopters and 10 brush engines responded to the blaze that sparked in a homeless encampment at around 10:15 p.m., Chula Vista Fire Battalion Chief Ron Nelson Ron Nelson said.
The Chula Vista Police Department said they responded to conduct evacuations in the area.
There were no homes nearby but there were several businesses threatened in the area of Faivre Street, Hollister Street, Beyer Road and Palm Avenue, Nelson said.
The manager at the nearby La Palma Mobile Home Estates said residents of more than 100 properties could have been evacuated.
Helicopters were overhead making water drops, and ground crews were seen hiking in and out of the riverbed with hoses, chainsaws axes and other equipment.
By around midnight, winds in the area had died down helping firefighters gain a handle on the flames.
Within two hours, the fire was an estimated two acres and the foreward rate of spread had been stopped.
The fire broke out amid a Red Flag Warning that wasn't set to expire until 6 p.m. Thursday.
No other information was available.
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