In the United States, two Philadelphia police officers were shot during a July 4 celebration.
In southeast Sacramento, California, a wildfire is spreading very fast.
More than 50 million people in 18 US states are under extreme heat alert.
In Australia, at least 50,000 New South Wales residents are facing evacuation orders due to flooding caused by torrential rains.
Airports in the United States return to normal after the July 4 holiday.
