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In pictures: Heat and lightning strikes to blame for massive wildfires in California

Massive blazes that have spread across California have so far led to five deaths and the evacuation of thousands of people across the state, with tens of thousands of homes in danger.

The authorities say that lightning is responsible for the fires, over 350 of which have broken out amid a blistering heatwave.

At least 50 buildings have been destroyed and others damaged by the fires, which are being fought by firefighting crews.