According to NBC News [nbcnews.com], four hikers have died due to hot weather in the U.S. state of Arizona.
The deaths occurred in separate incidents; one victim had "taken along plenty of water and [was] immediately treated by a doctor." Besides the four known to have died, another hiker, who was hiking with one of the victims, is missing.
Weather conditions are thought to be a factor in a wildfire in Arizona and four wildfires in the neighbouring states of New Mexico and California, one of which has burned 24 houses.
Temperatures in Phoenix were predicted to rise to 120° F (49° C) on Monday.