Massive wildfires rage in California

The Woolsey Fire in Southern California has charred 91,572 acres and is 20% contained, according to the California Department of Forestry and Fire Protection.

The area is under a red flag warning until Tuesday afternoon, and gusty winds and low humidity will persist.

Here's what we know about the fire so far:

Malibu resident Ari Soffer took this video of some of the damage:

At least 31 people were killed and more than 300,000 people have evacuated as three massive wildfires burn across California.

Below are ways you can assist those affected or get help if you're in need.

Camp Fire: The largest of the three major blazes, the Camp Fire has scorched 111,000 acres across Northern California and is about 25% contained, according to the state firefighting agency Cal Fire. It has destroyed an estimated 6,700 buildings, most of which were homes.

Woolsey and Hill fires: In Southern California, the Woolsey Fire had spread to 85,500 acres and is about 15% contained. The nearby Hill Fire covered 4,531 acres and was 75% contained. Together, the fires are responsible for the destruction of 179 structures, but another 57,000 are threatened, fire officials said.

Mass evacuations: More than 300,000 people have been forced from their homes statewide. The majority of those residents are in Los Angeles County, where 170,000 were evacuated.

The map below shows these and the other active fires burning in California.

The three wildfires are moving across land with a terrifying speed.

At its fastest, the Camp Fire in Northern California spread at more than a football field a second, or around 80 football fields per minute.

There are four main reasons why the fires are moving so fast:

What about President Trump's assertion that the fires were because "forest management is so poor"? Not accurate, meteorologists said.

Watch more:

The Woolsey Fire, which has burned 85,500 acres and is just 15 percent contained, has already destroyed 177 structures and threatens 57,000 structures more.

Neil Young, Robin Thicke, Gerard Butler and Miley Cyrus are among those whose houses were hit by the fire raging north of Los Angeles.

See their posts about the fire below:

In a post on his official website decrying the impact of climate change, Neil Young said "I have lost my home before to a California wildfire, now another."

The Mayor Pro Tem of Malibu was hospitalized over the weekend while trying to save his home from burning in the Woolsey Fire, according to the city.

"The City extends its support and best wishes for a complete recovery and quick return to the community that he loves," the city added.

According to his bio page, Wagner is a special effects artist, runs Zuma Jay’s Surf Shop, and was elected to a second term this month.

The Camp Fire has destroyed an estimated 2,000 structures, "threatened" 15,000, and left three firefighters injured, according to the latest incident report by the California Department of Forestry and Fire Protection (Cal Fire). 

“The fire burned through the Town of Paradise and Concow Thursday, these areas will continue to experience active burning throughout the day,” the report says.

“The fire continues to burn to the Northwest into Magalia and toward Stirling City. Extremely dry fuels and heavy fuel loads in combination with low relative humidity will continue to active fire and control efforts.”  

On Friday afternoon, five bodies were found in a vehicle that was caught in the flames.

By the numbers – the Camp Fire:

Calfire is currently estimating that 2,000 structures have burned in the Camp Fire. If that holds true it would be the 4th most destructive wildfire in California history.

It would also mean that five of the top ten most destructive California fires have happened in the past two years.

Last year's Tubbs fire is the most destructive with 5,636 structures burned.

Early Friday morning, Facebook activated its Safety Check feature for the Woolsey Fire, allowing people in the area to mark themselves as "safe."

It also allowed those in the affected area to create fundraisers and ask for or offer help.

According to Facebook, more than 150 people requested help as of 1 p.m. ET this afternoon, asking for information, transportation and water.

Visit the Crisis Response page here.