City engulfed by 50-mile dust cloud
A massive dust storm has descended on the Phoenix area of the US, drastically reducing visibility and delaying flights as strong winds toppled trees and caused power outages for thousands of residents in the valley.
The wall of dust towered over city centre skyscrapers after it swept across the desert from the south, and KSAZ-TV reported it appeared to be roughly 50 miles wide in some spots.
