Wildfires in California
Media playback is unsupported on your device

Wildfires sweep across northern California

22 August 2012 Last updated at 06:27 BST

Firefighters are battling to control wildfires in northern California

The blaze has forced thousands of people from their homes.

It's still unclear what started the fire, but officials say it's likely lightning strikes caused the fires.

Wendy Urquhart reports.