Wildfires erupt in Arizona and California in foreboding sign of intense summer

A blaze near Flagstaff, Arizona, has already burned 5,000 acres, fanned by strong winds and fed by dry grasses and brush

Scorching temperatures and desperately dry conditions set the stage for the rapid spread of several explosive wildfires that erupted over the weekend, forcing evacuations in California and Arizona.

The blazes are among dozens that have broken out across the US south-west early in the summer, including a ferocious fire in New Mexico that became the worst in the state's history. Officials say it's a foreboding sign of what is shaping up to be another intense year of fire.