Santa Ana winds will continue whipping through Southern California through Thursday, sparking fears that progress made fighting wildfires that have scorched over 40,000 acres and left 28 dead could be reversed and more blazes could break out.

Millions of California residents were placed under a red flag warning through Thursday amid threats of further fires with looming winds in the forecast, according to multiple reports.

A new wildfire expanded rapidly north of Los Angeles, growing to more than 5,000 acres and forcing more evacuations. Strong winds kept Los Angeles County on high alert. And some who lost their homes found themselves dealing with a new concern: having their identities stolen by criminals fraudulently applying for relief benefits.