What started the California fires? Are evacuations still in effect?

Napa County firefighter Jason Sheumann sprays water on a home as he battles flames from a wildfire Monday, Oct. 9, 2017, in Napa, Calif. Wildfires whipped by powerful winds swept through Northern California sending residents on a headlong flight to safety through smoke and flames as homes burned. (AP Photo/Rich Pedroncelli)

What started the deadly and destructive wildfires that exploded this week in California?

CAL FIRE said Tuesday that 17 new large fires broke out over the past 36 hours.

Other than the windy conditions that helped drive them all, there was no known connection between the blazes, and no cause has been released for any of them, The Associated Press reports.

October has generally been the most destructive time of year for California wildfires, The Associated Press reports.

The list below does not yet reflect fires from 2017.

But it was unusual for many fires to take off at the same time.

"Typically, lightning causes less than 10 percent of the fires within CAL FIRES's jurisdiction," according to the agency's fire statistics.

If the fires weren't ignited by lightning, that leaves human activity - either negligent behavior, or intentional arson - as possible causes. Mechanical problems with equipment or vehicles can also ignite fires.

As of Tuesday, the cause of the fires in California remain under investigation.

CAL FIRE maintains a list of fires and evacuation areas, and posts briefings on Facebook.

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