Multiple wildfires have pushed tens of thousands of residents to flee their homes, and strong winds have exacerbated the emergency, officials say.

Although the cause of each blaze has yet to be determined, they all burned in or near foothill communities amid gusty winds and dry air and vegetation.

The American Red Cross is helping wildfire victims find shelter and food. Call the American Red Cross hotline at 1-800-RED CROSS or text CAWILDFIRES to 90999 to make a donation. The nonprofit organization urged Californians to sign up to give blood, noting that blood donations have dropped since the fires began.