Firefighters from Australia and New Zealand have flown out of Sydney on a mission to relieve exhausted crews battling deadly wildfires sweeping the northwest of the United States.
About 100 fire-fighters set off as conditions turned gusty in the mountains north of Sacramento, where fierce fires were among 100 burning across 13 western U.S. states.
The 11-day-old Carr Fire, stoked by drought-parched vegetation and triple-digit temperatures, is the most fearsome.
It has killed six persons, reduced 1,555 structures to ruins and ranks as the sixth most destructive wildfire on record in California.
